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StreamExecutionEnvironment see = StreamExecutionEnvironment.getExecutionEnvironment();
DataStream<WikipediaEditEvent> edits = see.addSource( new WikipediaEditsSource() );
KeyedStream<WikipediaEditEvent, String> keyedEdits = edits.keyBy(event -> event.getUser());
DataStream<Tuple2<String, Long>> result = keyedEdits
  .timeWindow( Time.seconds( 5 ) )
  .fold( new Tuple2<>( "", 0L ), (acc, event) -> {
    acc.f0 = event.getUser();
    acc.f1 += event.getByteDiff();
    return acc;
  });
result.print();
see.execute();

// Create a local StreamingContext with two working thread and batch interval of 1 second
SparkConf conf = new SparkConf().setMaster( "local[2]" ).setAppName( "NetworkWordCount" );
JavaStreamingContext jssc = new JavaStreamingContext( conf, Durations.seconds( 1 ) );
// Create a DStream that will connect to hostname:port, like localhost:9999
JavaReceiverInputDStream<String> lines = jssc.socketTextStream( "localhost", 9999 );
// Split each line into words
JavaDStream<String> words = lines.flatMap(x -> Arrays.asList( x.split( " " ) ).iterator());
// Count each word in each batch
JavaPairDStream<String, Integer> pairs = words.mapToPair(s -> new Tuple2<>( s, 1 ));
JavaPairDStream<String, Integer> wordCounts = pairs.reduceByKey((i1, i2) -> i1 + i2);
// Print the first ten elements of each RDD generated in this DStream to the console
wordCounts.print();