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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7524) Task "xxx" did not react to cancelling signal, but is stuck in method
Date Fri, 22 Sep 2017 09:49:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16176204#comment-16176204
] 

ASF GitHub Bot commented on FLINK-7524:
---------------------------------------

Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4639#discussion_r140449401
  
    --- Diff: flink-core/src/main/java/org/apache/flink/util/WrappingProxyUtil.java ---
    @@ -27,10 +27,16 @@ private WrappingProxyUtil() {
     		throw new AssertionError();
     	}
     
    +	@SuppressWarnings("unchecked")
     	public static <T> T stripProxy(T object) {
    -		while (object instanceof WrappingProxy) {
    +
    +		T previous = null;
    +
    +		while (object instanceof WrappingProxy && previous != object) {
    --- End diff --
    
    Guarding against infinite looping in case the bottom-most object is also a `WrappingProxy`?


> Task "xxx" did not react to cancelling signal, but is stuck in method
> ---------------------------------------------------------------------
>
>                 Key: FLINK-7524
>                 URL: https://issues.apache.org/jira/browse/FLINK-7524
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.3.0
>            Reporter: Bowen Li
>            Priority: Blocker
>             Fix For: 1.4.0
>
>
> Hi,
> I observed the following errors in taskmanager.log 
> {code:java}
> 2017-08-25 17:03:40,141 WARN  org.apache.flink.runtime.taskmanager.Task             
       - Task 'TriggerWindow(SlidingEventTimeWindows(259200000, 3600000), AggregatingStateDescriptor{serializer=org.apache.flink.api.java.typeutils.runtime.TupleSerializer@f65b6aa2,
aggFunction=com.streamingApp$MyAggregateFunction@1f193686}, EventTimeTrigger(), WindowedStream.aggregate(WindowedStream.java:858))
-> Sink: prod_item (2/6)' did not react to cancelling signal, but is stuck in method:
>  org.apache.flink.util.AbstractCloseableRegistry.unregisterClosable(AbstractCloseableRegistry.java:84)
> org.apache.flink.runtime.state.StateSnapshotContextSynchronousImpl.closeAndUnregisterStream(StateSnapshotContextSynchronousImpl.java:137)
> org.apache.flink.runtime.state.StateSnapshotContextSynchronousImpl.close(StateSnapshotContextSynchronousImpl.java:147)
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:399)
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.checkpointStreamOperator(StreamTask.java:1157)
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1089)
> org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:653)
> org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:589)
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:542)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.notifyCheckpoint(BarrierBuffer.java:378)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.processBarrier(BarrierBuffer.java:281)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:183)
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:213)
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:69)
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:262)
> org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> java.lang.Thread.run(Thread.java:748)
> ...
> 2017-08-25 17:05:10,139 INFO  org.apache.flink.runtime.taskmanager.Task             
       - Notifying TaskManager about fatal error. Task 'TriggerWindow(SlidingEventTimeWindows(259200000,
3600000), AggregatingStateDescriptor{serializer=org.apache.flink.api.java.typeutils.runtime.TupleSerializer@f65b6aa2,
aggFunction=com.streamingApp$MyAggregateFunction@1f193686}, EventTimeTrigger(), WindowedStream.aggregate(WindowedStream.java:858))
-> Sink: prod_item (2/6)' did not react to cancelling signal in the last 30 seconds, but
is stuck in method:
>  org.apache.flink.util.AbstractCloseableRegistry.unregisterClosable(AbstractCloseableRegistry.java:84)
> org.apache.flink.runtime.state.StateSnapshotContextSynchronousImpl.closeAndUnregisterStream(StateSnapshotContextSynchronousImpl.java:137)
> org.apache.flink.runtime.state.StateSnapshotContextSynchronousImpl.close(StateSnapshotContextSynchronousImpl.java:147)
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:399)
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.checkpointStreamOperator(StreamTask.java:1157)
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1089)
> org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:653)
> org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:589)
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:542)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.notifyCheckpoint(BarrierBuffer.java:378)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.processBarrier(BarrierBuffer.java:281)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:183)
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:213)
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:69)
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:262)
> org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> java.lang.Thread.run(Thread.java:748)
> .
> 2017-08-25 17:05:10,140 ERROR org.apache.flink.yarn.YarnTaskManager                 
       - 
> ==============================================================
> ======================      FATAL      =======================
> ==============================================================
> A fatal error occurred, forcing the TaskManager to shut down: Task 'TriggerWindow(SlidingEventTimeWindows(259200000,
3600000), AggregatingStateDescriptor{serializer=org.apache.flink.api.java.typeutils.runtime.TupleSerializer@f65b6aa2,
aggFunction=com.streamingApp$MyAggregateFunction@1f193686}, EventTimeTrigger(), WindowedStream.aggregate(WindowedStream.java:858))
-> Sink: prod_item (2/6)' did not react to cancelling signal in the last 30 seconds, but
is stuck in method:
>  org.apache.flink.util.AbstractCloseableRegistry.unregisterClosable(AbstractCloseableRegistry.java:84)
> org.apache.flink.runtime.state.StateSnapshotContextSynchronousImpl.closeAndUnregisterStream(StateSnapshotContextSynchronousImpl.java:137)
> org.apache.flink.runtime.state.StateSnapshotContextSynchronousImpl.close(StateSnapshotContextSynchronousImpl.java:147)
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:399)
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.checkpointStreamOperator(StreamTask.java:1157)
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1089)
> org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:653)
> org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:589)
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:542)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.notifyCheckpoint(BarrierBuffer.java:378)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.processBarrier(BarrierBuffer.java:281)
> org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:183)
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:213)
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:69)
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:262)
> org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> java.lang.Thread.run(Thread.java:748)
> {code}
> Why is the task stucked?



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