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From "Timo Walther (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-8282) Transformation with TwoInputStreamOperator fails
Date Mon, 18 Dec 2017 15:35:02 GMT
Timo Walther created FLINK-8282:
-----------------------------------

             Summary: Transformation with TwoInputStreamOperator fails
                 Key: FLINK-8282
                 URL: https://issues.apache.org/jira/browse/FLINK-8282
             Project: Flink
          Issue Type: Bug
          Components: DataStream API
            Reporter: Timo Walther


The following program fails because of multiple reasons (see exceptions below). The transformation
with a {{TwoInputStreamOperator}} does not extend {{AbstractStreamOperator}}. I think this
is the main cause why it fails. Either we fix the exceptions or we check for {{AbstractStreamOperator}}
first.

{code}
		final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);

		DataStream<Integer> ds1 = env.addSource(new SourceFunction<Integer>() {
			@Override
			public void run(SourceContext<Integer> ctx) throws Exception {
				ctx.emitWatermark(new Watermark(100L));
				ctx.collect(12);
				while (true) Thread.yield();
			}

			@Override
			public void cancel() {

			}
		});

		DataStream<Integer> ds2 = env.addSource(new SourceFunction<Integer>() {
			@Override
			public void run(SourceContext<Integer> ctx) throws Exception {
				ctx.emitWatermark(new Watermark(200L));
				ctx.collect(12);
				while (true) Thread.yield();
			}

			@Override
			public void cancel() {

			}
		});

		ds1.connect(ds2.broadcast()).transform("test", Types.INT, new TwoInputStreamOperator<Integer,
Integer, Integer>() {
			@Override
			public void processElement1(StreamRecord<Integer> element) throws Exception {
				System.out.println();
			}

			@Override
			public void processElement2(StreamRecord<Integer> element) throws Exception {
				System.out.println();
			}

			@Override
			public void processWatermark1(Watermark mark) throws Exception {
				System.out.println();
			}

			@Override
			public void processWatermark2(Watermark mark) throws Exception {
				System.out.println();
			}

			@Override
			public void processLatencyMarker1(LatencyMarker latencyMarker) throws Exception {

			}

			@Override
			public void processLatencyMarker2(LatencyMarker latencyMarker) throws Exception {

			}

			@Override
			public void setup(StreamTask<?, ?> containingTask, StreamConfig config, Output<StreamRecord<Integer>>
output) {

			}

			@Override
			public void open() throws Exception {

			}

			@Override
			public void close() throws Exception {

			}

			@Override
			public void dispose() throws Exception {

			}

			@Override
			public OperatorSnapshotResult snapshotState(long checkpointId, long timestamp, CheckpointOptions
checkpointOptions) throws Exception {
				return null;
			}

			@Override
			public void initializeState(OperatorSubtaskState stateHandles) throws Exception {

			}

			@Override
			public void notifyOfCompletedCheckpoint(long checkpointId) throws Exception {

			}

			@Override
			public void setKeyContextElement1(StreamRecord<?> record) throws Exception {

			}

			@Override
			public void setKeyContextElement2(StreamRecord<?> record) throws Exception {

			}

			@Override
			public ChainingStrategy getChainingStrategy() {
				return null;
			}

			@Override
			public void setChainingStrategy(ChainingStrategy strategy) {

			}

			@Override
			public MetricGroup getMetricGroup() {
				return null;
			}

			@Override
			public OperatorID getOperatorID() {
				return null;
			}
		}).print();

		// execute program
		env.execute("Streaming WordCount");
{code}

Exceptions are either:

{code}
16:27:51,177 WARN  org.apache.flink.streaming.api.operators.AbstractStreamOperator  - Error
while emitting latency marker.
java.lang.RuntimeException: Buffer pool is destroyed.
	at org.apache.flink.streaming.runtime.io.RecordWriterOutput.emitLatencyMarker(RecordWriterOutput.java:141)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.emitLatencyMarker(AbstractStreamOperator.java:825)
	at org.apache.flink.streaming.api.operators.StreamSource$LatencyMarksEmitter$1.onProcessingTime(StreamSource.java:150)
	at org.apache.flink.streaming.runtime.tasks.SystemProcessingTimeService$RepeatedTriggerTask.run(SystemProcessingTimeService.java:294)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Buffer pool is destroyed.
	at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBuffer(LocalBufferPool.java:203)
	at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBufferBlocking(LocalBufferPool.java:191)
	at org.apache.flink.runtime.io.network.api.writer.RecordWriter.sendToTarget(RecordWriter.java:132)
	at org.apache.flink.runtime.io.network.api.writer.RecordWriter.randomEmit(RecordWriter.java:107)
	at org.apache.flink.streaming.runtime.io.StreamRecordWriter.randomEmit(StreamRecordWriter.java:102)
	at org.apache.flink.streaming.runtime.io.RecordWriterOutput.emitLatencyMarker(RecordWriterOutput.java:138)
	... 10 more
{code}

or

{code}
16:33:53,826 WARN  org.apache.flink.streaming.runtime.io.StreamTwoInputProcessor  - An exception
occurred during the metrics setup.
java.lang.NullPointerException
	at org.apache.flink.streaming.runtime.io.StreamTwoInputProcessor.processInput(StreamTwoInputProcessor.java:211)
	at org.apache.flink.streaming.runtime.tasks.TwoInputStreamTask.run(TwoInputStreamTask.java:91)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:278)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:724)
	at java.lang.Thread.run(Thread.java:745)
{code}



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