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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9388) Inconsistency in job shutdown produces confusing log message
Date Thu, 17 May 2018 18:03:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479472#comment-16479472
] 

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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