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https://issues.apache.org/jira/browse/STORM-405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14078491#comment-14078491
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ASF GitHub Bot commented on STORM-405:
--------------------------------------
Github user wurstmeister commented on a diff in the pull request:
https://github.com/apache/incubator-storm/pull/195#discussion_r15556292
--- Diff:
external/storm-kafka/src/test/storm/kafka/TridentKafkaTopology.java ---
@@ -0,0 +1,101 @@
+/**
+ * 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 storm.kafka;
+
+import backtype.storm.Config;
+import backtype.storm.LocalCluster;
+import backtype.storm.generated.StormTopology;
+import backtype.storm.tuple.Fields;
+import backtype.storm.tuple.Values;
+import storm.kafka.trident.TridentKafkaState;
+import storm.kafka.trident.TridentKafkaStateFactory;
+import storm.kafka.trident.TridentKafkaUpdater;
+import storm.kafka.trident.mapper.FieldNameBasedTupleToKafkaMapper;
+import storm.kafka.trident.selector.DefaultTopicSelector;
+import storm.trident.Stream;
+import storm.trident.TridentTopology;
+import storm.trident.testing.FixedBatchSpout;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+
+
+public class TridentKafkaTopology {
+
+ private static StormTopology buildTopology() {
+ Fields fields = new Fields("word", "count");
+ FixedBatchSpout spout = new FixedBatchSpout(fields, 4,
+ new Values("storm", "1"),
+ new Values("trident", "1"),
+ new Values("needs", "1"),
+ new Values("javadoc", "1")
+ );
+ spout.setCycle(true);
+
+ TridentTopology topology = new TridentTopology();
+ Stream stream = topology.newStream("spout1", spout);
+
+ TridentKafkaStateFactory stateFactory = new
TridentKafkaStateFactory()
+ .withKafkaTopicSelector(new DefaultTopicSelector("test"))
+ .withTridentTupleToKafkaMapper(new
FieldNameBasedTupleToKafkaMapper("word", "count"));
+ stream.partitionPersist(stateFactory, fields, new
TridentKafkaUpdater(), new Fields());
+
+ return topology.build();
+ }
+
+ /**
+ * To run this topology ensure you have a kafka broker running and
provide connection string to broker as argument.
+ * Create a topic test with command line,
+ * kafka-topics.sh --create --zookeeper localhost:2181
--replication-factor 1 --partition 1 --topic test
+ *
+ * run this program and run the kafka consumer:
+ * afka-console-consumer.sh --zookeeper localhost:2181 --whitelist
test --from-beginning
--- End diff --
small typo, also I think --topic (rather than --whitelist) would be
sufficient for this example
> Add kafka trident state so messages can be sent to kafka topics
> ---------------------------------------------------------------
>
> Key: STORM-405
> URL: https://issues.apache.org/jira/browse/STORM-405
> Project: Apache Storm (Incubating)
> Issue Type: Improvement
> Affects Versions: 0.9.3-incubating
> Reporter: Parth Brahmbhatt
> Priority: Minor
> Fix For: 0.9.3-incubating
>
>
> Currently storm has a bolt for writing to kafka but we have no implementation
> of trident state. We need a trident state implementation that allows wrting
> tuples directly to kafka topics as part of trident topology.
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