[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r316243949
##
File path:
flink-walkthroughs/flink-walkthrough-datastream-scala/src/main/resources/archetype-resources/src/main/scala/FraudDetector.scala
##
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ${package}
+
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction
+import org.apache.flink.util.Collector
+import org.apache.flink.walkthrough.common.entity.Alert
+import org.apache.flink.walkthrough.common.entity.Transaction
+
+
+/**
+ * Skeleton code for implementing a fraud detector.
+ */
+object FraudDetector {
+ val SMALL_AMOUNT = 1.00
+ val LARGE_AMOUNT = 500.00
+ val ONE_DAY = 24 * 60 * 60 * 1000L
+}
+
+@SerialVersionUID(1L)
+class FraudDetector extends KeyedProcessFunction[Long, Transaction, Alert] {
+
+ @throws[Exception]
+ def processElement(
+transaction: Transaction,
+context: KeyedProcessFunction[Long, Transaction, Alert]#Context,
Review comment:
```suggestion
context: KeyedProcessFunction[Long, Transaction, Alert]#Context,
```
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r316243872
##
File path:
flink-walkthroughs/flink-walkthrough-datastream-scala/src/main/resources/archetype-resources/src/main/scala/FraudDetector.scala
##
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ${package}
+
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction
+import org.apache.flink.util.Collector
+import org.apache.flink.walkthrough.common.entity.Alert
+import org.apache.flink.walkthrough.common.entity.Transaction
+
+
+/**
+ * Skeleton code for implementing a fraud detector.
+ */
+object FraudDetector {
+ val SMALL_AMOUNT = 1.00
+ val LARGE_AMOUNT = 500.00
+ val ONE_DAY = 24 * 60 * 60 * 1000L
+}
+
+@SerialVersionUID(1L)
+class FraudDetector extends KeyedProcessFunction[Long, Transaction, Alert] {
+
+ @throws[Exception]
+ def processElement(
+transaction: Transaction,
Review comment:
```suggestion
transaction: Transaction,
```
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r316243997
##
File path:
flink-walkthroughs/flink-walkthrough-datastream-scala/src/main/resources/archetype-resources/src/main/scala/FraudDetector.scala
##
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ${package}
+
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction
+import org.apache.flink.util.Collector
+import org.apache.flink.walkthrough.common.entity.Alert
+import org.apache.flink.walkthrough.common.entity.Transaction
+
+
+/**
+ * Skeleton code for implementing a fraud detector.
+ */
+object FraudDetector {
+ val SMALL_AMOUNT = 1.00
+ val LARGE_AMOUNT = 500.00
+ val ONE_DAY = 24 * 60 * 60 * 1000L
+}
+
+@SerialVersionUID(1L)
+class FraudDetector extends KeyedProcessFunction[Long, Transaction, Alert] {
+
+ @throws[Exception]
+ def processElement(
+transaction: Transaction,
+context: KeyedProcessFunction[Long, Transaction, Alert]#Context,
+collector: Collector[Alert]): Unit = {
Review comment:
```suggestion
collector: Collector[Alert]): Unit = {
```
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r316212564
##
File path: flink-end-to-end-tests/test-scripts/test_cli.sh
##
@@ -29,23 +29,12 @@ $FLINK_DIR/bin/taskmanager.sh start
$FLINK_DIR/bin/taskmanager.sh start
# CLI regular expressions
-JOB_ID_REGEX_EXTRACTOR=".*JobID ([0-9,a-f]*)"
JOB_INFO_PACT_DATA_SOURCE_REGEX_EXTRACTOR="\"pact\": \"(Data Source)\""
JOB_INFO_PACT_DATA_SINK_REGEX_EXTRACTOR="\"pact\": \"(Data Sink)\""
JOB_LIST_REGEX_EXTRACTOR_BY_STATUS="([0-9,a-f]*) :"
EXIT_CODE=0
-function extract_job_id_from_job_submission_return() {
-if [[ $1 =~ $JOB_ID_REGEX_EXTRACTOR ]];
-then
-JOB_ID="${BASH_REMATCH[1]}";
-else
-JOB_ID=""
-fi
-echo "$JOB_ID"
-}
-
Review comment:
I think, you missed putting this function into `common.sh` because now, it
is not defined anywhere
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r316243271
##
File path:
flink-walkthroughs/flink-walkthrough-datastream-java/src/main/resources/archetype-resources/src/main/java/FraudDetectionJob.java
##
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ${package};
+
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.walkthrough.common.sink.AlertSink;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+/**
+ * Skeleton code for the datastream walkthrough
+ */
+public class FraudDetectionJob {
+ public static void main(String[] args) throws Exception {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+ DataStream transactions = env
+ .addSource(new TransactionSource())
+ .name("transactions");
+
+ DataStream alerts = transactions
+ .keyBy(transaction -> transaction.getAccountId())
Review comment:
you marked this as resolved but did not change the code
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r316208674
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,925 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779216
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315736409
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315731643
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779688
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779550
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779896
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315734913
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315734830
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779928
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779622
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315733101
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315734988
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315739004
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779309
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315774824
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315726277
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779147
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779090
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315733418
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315734307
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779717
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779039
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315776102
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779418
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315737043
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315729123
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779589
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779264
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315778858
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779371
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779453
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315777453
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779867
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315729910
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315779769
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,923 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+{% panel **Note:** Each code block within this walkthrough may not contain the
full surrounding class for brevity. The full code is available [at the bottom
of the page](#final-application). %}
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
Stream
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r315724419
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314372567
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314359211
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314355274
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314355969
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314355874
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314356067
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314328375
##
File path: flink-end-to-end-tests/test-scripts/test_datastream_walkthroughs.sh
##
@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# End to end test for quick starts test.
+# Usage:
+# FLINK_DIR=
flink-end-to-end-tests/test-scripts/test_datastream_walkthroughs.sh
+
+source "$(dirname "$0")"/common.sh
+
+TEST_TYPE=$1
+
+mkdir -p "${TEST_DATA_DIR}"
+cd "${TEST_DATA_DIR}"
+
+ARTIFACT_ID=flink-walkthrough-datastream-${TEST_TYPE}
+ARTIFACT_VERSION=0.1
+
+mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-${TEST_TYPE} \
+-DarchetypeVersion=${FLINK_VERSION} \
+-DgroupId=org.apache.flink.walkthrough \
+-DartifactId=${ARTIFACT_ID} \
+-Dversion=${ARTIFACT_VERSION} \
+-Dpackage=org.apache.flink.walkthrough \
+-DinteractiveMode=false
+
+cd "${ARTIFACT_ID}"
+
+mvn clean package -nsu > compile-output.txt
+
+if [[ `grep -c "BUILD FAILURE" compile-output.txt` -eq '1' ]]; then
+echo "Failure: The walkthrough did not successfully compile"
+cat compile-output.txt
+exit 1
+fi
+
+cd target
+jar tvf ${ARTIFACT_ID}-${ARTIFACT_VERSION}.jar > contentsInJar.txt
+
+if [[ `grep -c "org/apache/flink/api/java" contentsInJar.txt` -eq '0' && \
+ `grep -c "org/apache/flink/streaming/api" contentsInJar.txt` -eq '0' && \
+ `grep -c "org/apache/flink/streaming/experimental" contentsInJar.txt`
-eq '0' && \
+ `grep -c "org/apache/flink/streaming/runtime" contentsInJar.txt` -eq '0'
&& \
+ `grep -c "org/apache/flink/streaming/util" contentsInJar.txt` -eq '0'
]]; then
+
+echo "Success: There are no flink core classes are contained in the jar."
+else
+echo "Failure: There are flink core classes are contained in the jar."
+exit 1
+fi
+
+TEST_PROGRAM_JAR=${TEST_DATA_DIR}/${ARTIFACT_ID}/target/${ARTIFACT_ID}-${ARTIFACT_VERSION}.jar
+
+start_cluster
+
+JOB_ID=""
+EXIT_CODE=0
+
+# CLI regular expressions
+JOB_ID_REGEX_EXTRACTOR=".*JobID ([0-9,a-f]*)"
+
+function extract_job_id_from_job_submission_return() {
+if [[ $1 =~ $JOB_ID_REGEX_EXTRACTOR ]];
+then
+JOB_ID="${BASH_REMATCH[1]}";
+else
+JOB_ID=""
+fi
+echo "$JOB_ID"
+}
Review comment:
This job regexp parsing is copied from `test_cli.sh` - how about extracting
this into `common.sh` instead and de-duplicate it?
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314354545
##
File path:
flink-walkthroughs/flink-walkthrough-datastream-java/src/main/resources/archetype-resources/src/main/java/FraudDetector.java
##
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ${package};
+
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+
+/**
+ * Skeleton code for implementing a fraud detector.
+ */
+public class FraudDetector extends KeyedProcessFunction {
Review comment:
```suggestion
public class FraudDetector extends KeyedProcessFunction {
private static final long serialVersionUID = 1L;
```
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To respond to the message, please log on to GitHub and use the
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314356151
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314327108
##
File path: flink-end-to-end-tests/test-scripts/test_datastream_walkthroughs.sh
##
@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# End to end test for quick starts test.
+# Usage:
+# FLINK_DIR=
flink-end-to-end-tests/test-scripts/test_datastream_walkthroughs.sh
+
+source "$(dirname "$0")"/common.sh
+
+TEST_TYPE=$1
+
+mkdir -p "${TEST_DATA_DIR}"
+cd "${TEST_DATA_DIR}"
+
+ARTIFACT_ID=flink-walkthrough-datastream-${TEST_TYPE}
+ARTIFACT_VERSION=0.1
+
+mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-${TEST_TYPE} \
+-DarchetypeVersion=${FLINK_VERSION} \
+-DgroupId=org.apache.flink.walkthrough \
+-DartifactId=${ARTIFACT_ID} \
+-Dversion=${ARTIFACT_VERSION} \
+-Dpackage=org.apache.flink.walkthrough \
+-DinteractiveMode=false
+
+cd "${ARTIFACT_ID}"
+
+mvn clean package -nsu > compile-output.txt
+
+if [[ `grep -c "BUILD FAILURE" compile-output.txt` -eq '1' ]]; then
+echo "Failure: The walkthrough did not successfully compile"
+cat compile-output.txt
Review comment:
how about adding this line to the `test_table_walkthroughs.sh` script as
well (as a separate hotfix)?
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r314346019
##
File path:
flink-walkthroughs/flink-walkthrough-datastream-java/src/main/resources/archetype-resources/src/main/java/FraudDetector.java
##
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ${package};
+
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+
+/**
+ * Skeleton code for implementing a fraud detector.
+ */
+public class FraudDetector extends KeyedProcessFunction {
+
+ public static final double SMALL_AMOUNT = 0.01;
+
+ public static final double LARGE_AMOUNT = 500.00;
+
+ public static final long ONE_DAY = 24 * 60 * 60 * 1000;
+
+ @Override
+ public void processElement(
+ Transaction transaction,
+ Context context,
+ Collector collector) throws Exception {
Review comment:
nit: indent parameters one more level
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
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With regards,
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313968043
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313963709
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313963390
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313970175
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313935478
##
File path:
flink-walkthroughs/flink-walkthrough-datastream-java/src/main/resources/archetype-resources/src/main/java/FraudDetectionJob.java
##
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ${package};
+
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.walkthrough.common.sink.AlertSink;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+/**
+ * Skeleton code for the datastream walkthrough
+ */
+public class FraudDetectionJob {
+ public static void main(String[] args) throws Exception {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+ DataStream transactions = env
+ .addSource(new TransactionSource())
+ .name("transactions");
+
+ DataStream alerts = transactions
+ .keyBy(transaction -> transaction.getAccountId())
Review comment:
use method reference like in the doc?
```suggestion
.keyBy(Transaction::getAccountId)
```
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
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[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313971393
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313965485
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313962007
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313934235
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313965667
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313963523
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313964982
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313968842
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313933764
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313933452
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313971592
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313964550
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313964081
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313962354
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313964293
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313966205
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313965190
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313970370
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313965798
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313934715
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313932376
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313964427
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313963875
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313962684
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
[GitHub] [flink] NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting Started - DataStream Example Walkthrough
NicoK commented on a change in pull request #9210: [FLINK-12746][docs] Getting
Started - DataStream Example Walkthrough
URL: https://github.com/apache/flink/pull/9210#discussion_r313934769
##
File path: docs/getting-started/walkthroughs/datastream_api.md
##
@@ -0,0 +1,897 @@
+---
+title: "DataStream API"
+nav-id: datastreamwalkthrough
+nav-title: 'DataStream API'
+nav-parent_id: walkthroughs
+nav-pos: 2
+---
+
+
+Apache Flink offers a DataStream API for building robust, stateful streaming
applications.
+It provides fine-grained control over state and time, which allows for the
implementation of complex event-driven systems.
+
+* This will be replaced by the TOC
+{:toc}
+
+## What Are You Building?
+
+Credit card fraud is a growing concern in the digital age.
+Criminals steal credit card numbers by running scams or hacking into insecure
systems.
+Stolen numbers are tested by making one or more small purchases, often for a
dollar or less.
+If that works, they then make more significant purchases to get items they can
sell or keep for themselves.
+
+In this tutorial, you will build a fraud detection system for alerting on
suspicious credit card transactions.
+Using a simple set of rules, you will see how Flink allows us to implement
advanced business logic and act in real-time.
+
+## Prerequisites
+
+This walkthrough assumes that you have some familiarity with Java or Scala,
but you should be able to follow along even if you are coming from a different
programming language.
+
+## Help, I’m Stuck!
+
+If you get stuck, check out the [community support
resources](https://flink.apache.org/community.html).
+In particular, Apache Flink's [user mailing
list](https://flink.apache.org/community.html#mailing-lists) is consistently
ranked as one of the most active of any Apache project and a great way to get
help quickly.
+
+## How To Follow Along
+
+If you want to follow along, you will require a computer with:
+
+* Java 8
+* Maven
+
+A provided Flink Maven Archetype will create a skeleton project with all the
necessary dependencies quickly:
+
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-java \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+{% highlight bash %}
+$ mvn archetype:generate \
+-DarchetypeGroupId=org.apache.flink \
+-DarchetypeArtifactId=flink-walkthrough-datastream-scala \{% unless
site.is_stable %}
+
-DarchetypeCatalog=https://repository.apache.org/content/repositories/snapshots/
\{% endunless %}
+-DarchetypeVersion={{ site.version }} \
+-DgroupId=frauddetection \
+-DartifactId=frauddetection \
+-Dversion=0.1 \
+-Dpackage=spendreport \
+-DinteractiveMode=false
+{% endhighlight %}
+
+
+
+{% unless site.is_stable %}
+
+Note: For Maven 3.0 or higher, it is no longer possible to specify
the repository (-DarchetypeCatalog) via the commandline. If you wish to use the
snapshot repository, you need to add a repository entry to your settings.xml.
For details about this change, please refer to http://maven.apache.org/archetype/maven-archetype-plugin/archetype-repository.html";>Maven
official document
+
+{% endunless %}
+
+You can edit the `groupId`, `artifactId` and `package` if you like. With the
above parameters,
+Maven will create a project with all the dependencies to complete this
tutorial.
+After importing the project into your editor, you will see a file with the
following code which you can run directly inside your IDE.
+
+
+
+ FraudDetectionJob.java
+
+{% highlight java %}
+package frauddetection;
+
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.util.Collector;
+import org.apache.flink.walkthrough.common.entity.Alert;
+import org.apache.flink.walkthrough.common.entity.Transaction;
+import org.apache.flink.walkthrough.common.source.TransactionSource;
+
+public class FraudDetectionJob {
+
+public static void main(String[] args) throws Exception {
+StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+DataStream transactions = env
+.addSource(new TransactionSource())
+.name("transactions");
+
+DataSt
