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https://issues.apache.org/jira/browse/FLINK-9388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479472#comment-16479472
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Stephan Ewen commented on FLINK-9388:
-------------------------------------
When a task's status is canceled, any exception should be swallowed - they are
usually cancellation-related, and if they indicate a proper failure, it does
not matter as cancellation is already happening anyways.
The timer that does the latency marker emission seems to not follow that
pattern, yet.
> Inconsistency in job shutdown produces confusing log message
> ------------------------------------------------------------
>
> Key: FLINK-9388
> URL: https://issues.apache.org/jira/browse/FLINK-9388
> Project: Flink
> Issue Type: Bug
> Components: TaskManager
> Affects Versions: 1.5.0, 1.6.0
> Reporter: Stefan Richter
> Priority: Minor
>
> I found some logged exceptions in a user log that occurred during shutdown in
> the context of latency markers. Those exceptions are most certainly not a
> real problem, but can be confusing to users, so maybe we can get rid of them.
> {code}
> org.apache.flink.streaming.runtime.tasks.ExceptionInChainedOperatorException:
> Could not forward element to next operator
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:527)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.emitLatencyMarker(AbstractStreamOperator.java:676)
> at
> org.apache.flink.streaming.api.operators.StreamSource$LatencyMarksEmitter$1.onProcessingTime(StreamSource.java:151)
> at
> org.apache.flink.streaming.runtime.tasks.SystemProcessingTimeService$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:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by:
> org.apache.flink.streaming.runtime.tasks.ExceptionInChainedOperatorException:
> Could not forward element to next operator
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:527)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.emitLatencyMarker(AbstractStreamOperator.java:676)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.reportOrForwardLatencyMarker(AbstractStreamOperator.java:652)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.processLatencyMarker(AbstractStreamOperator.java:635)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:524)
> ... 10 more
> Caused by:
> org.apache.flink.streaming.runtime.tasks.ExceptionInChainedOperatorException:
> Could not forward element to next operator
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:527)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.emitLatencyMarker(AbstractStreamOperator.java:676)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.reportOrForwardLatencyMarker(AbstractStreamOperator.java:652)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.processLatencyMarker(AbstractStreamOperator.java:635)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:524)
> ... 14 more
> Caused by:
> org.apache.flink.streaming.runtime.tasks.ExceptionInChainedOperatorException:
> Could not forward element to next operator
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:527)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.emitLatencyMarker(AbstractStreamOperator.java:676)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.reportOrForwardLatencyMarker(AbstractStreamOperator.java:652)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.processLatencyMarker(AbstractStreamOperator.java:635)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:524)
> ... 18 more
> Caused by: java.lang.RuntimeException: Buffer pool is destroyed.
> at
> org.apache.flink.streaming.runtime.io.RecordWriterOutput.emitLatencyMarker(RecordWriterOutput.java:147)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.emitLatencyMarker(AbstractStreamOperator.java:676)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.reportOrForwardLatencyMarker(AbstractStreamOperator.java:652)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.processLatencyMarker(AbstractStreamOperator.java:635)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitLatencyMarker(OperatorChain.java:524)
> ... 22 more
> Caused by: java.lang.IllegalStateException: Buffer pool is destroyed.
> at
> org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBufferBuilder(LocalBufferPool.java:211)
> at
> org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBufferBuilderBlocking(LocalBufferPool.java:199)
> at
> org.apache.flink.runtime.io.network.api.writer.RecordWriter.sendToTarget(RecordWriter.java:134)
> at
> org.apache.flink.runtime.io.network.api.writer.RecordWriter.randomEmit(RecordWriter.java:108)
> at
> org.apache.flink.streaming.runtime.io.StreamRecordWriter.randomEmit(StreamRecordWriter.java:102)
> at org.apache.
> {code}
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