Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/13957#discussion_r69362577
--- Diff:
examples/src/main/java/org/apache/spark/examples/sql/streaming/JavaStructuredNetworkWordCountWindowed.java
---
@@ -0,0 +1,116 @@
+/*
+ * 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 org.apache.spark.examples.sql.streaming;
+
+import org.apache.spark.api.java.function.FlatMapFunction;
+import org.apache.spark.sql.*;
+import org.apache.spark.sql.functions;
+import org.apache.spark.sql.streaming.StreamingQuery;
+import scala.Tuple2;
+
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Counts words in UTF8 encoded, '\n' delimited text received from the
network over a
+ * sliding window of configurable duration. Each line from the network is
tagged
+ * with a timestamp that is used to determine the windows into which it
falls.
+ *
+ * Usage: JavaStructuredNetworkWordCountWindowed <hostname> <port> <window
duration>
+ * <optional slide duration>
+ * <hostname> and <port> describe the TCP server that Structured Streaming
+ * would connect to receive data.
+ * <window duration> gives the size of window, specified as integer number
of seconds
+ * <slide duration> gives the amount of time successive windows are offset
from one another,
+ * given in the same units as above. <slide duration> should be less than
or equal to
+ * <window duration>. If the two are equal, successive windows have no
overlap. If
+ * <slide duration> is not provided, it defaults to <window duration>.
+ *
+ * To run this on your local machine, you need to first run a Netcat server
+ * `$ nc -lk 9999`
+ * and then run the example
+ * `$ bin/run-example
sql.streaming.JavaStructuredNetworkWordCountWindowed
+ * localhost 9999 <window duration> <optional slide duration>`
+ *
+ * One recommended <window duration>, <slide duration> pair is 60, 30
--- End diff --
nit: make it 10 and 5, so that user does not have to wait for 60 seconds to
see multiple windows.
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