Hi Konstantin,
this exception is thrown if you do not set the time characteristic to event
time and assign timestamps.
Please try to add
> env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime)
after you obtained the StreamExecutionEnvironment.
Best, Fabian
2016-04-22 15:47 GMT+02:00 Konstantin Kulagin <kkula...@gmail.com>:
> Hi guys,
>
> trying to run this example:
>
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> DataStreamSource<Tuple2<Long, String>> source = env.addSource(new
> SourceFunction<Tuple2<Long, String>>() {
> @Override
> public void run(SourceContext<Tuple2<Long, String>> ctx) throws
> Exception {
> LongStream.range(0, 33).forEach(l -> {
> ctx.collect(Tuple2.of(0L, "This is " + l));
> });
> }
>
> @Override
> public void cancel() {
> }
> });
>
>
> source.assignTimestampsAndWatermarks(new IngestionTimeExtractor<>()).
> // source.
>
> keyBy(0).window(GlobalWindows.create()).trigger(PurgingTrigger.of(CountTrigger.of(5))).
>
> apply(new WindowFunction<Tuple2<Long, String>, Void, Tuple,
> GlobalWindow>() {
> @Override
> public void apply(Tuple tuple, GlobalWindow window,
> Iterable<Tuple2<Long, String>> input, Collector<Void> out) throws Exception {
> System.out.println("!!!!!!!!! " + Joiner.on(",").join(input));
> }
> });
>
> env.execute("yoyoyo");
>
> Getting Caused by: java.lang.ClassCastException:
> org.apache.flink.streaming.api.watermark.Watermark cannot be cast to
> org.apache.flink.streaming.runtime.streamrecord.StreamRecord
> at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.serialize(StreamRecordSerializer.java:42)
> at
> org.apache.flink.runtime.plugable.SerializationDelegate.write(SerializationDelegate.java:56)
> at
> org.apache.flink.runtime.io.network.api.serialization.SpanningRecordSerializer.addRecord(SpanningRecordSerializer.java:79)
> at
> org.apache.flink.runtime.io.network.api.writer.RecordWriter.broadcastEmit(RecordWriter.java:109)
> at
> org.apache.flink.streaming.runtime.io.StreamRecordWriter.broadcastEmit(StreamRecordWriter.java:95)
> at
> org.apache.flink.streaming.runtime.io.RecordWriterOutput.emitWatermark(RecordWriterOutput.java:90)
>
>
> - After googling I've found this:
> https://issues.apache.org/jira/browse/FLINK-3688
>
> - went to github, downloaded branch 1.0.2 which contains specified change but
> having the same results.
>
> What am I missing here?
>
> Thanks!
>
> Konstantin
>
>
>
