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https://issues.apache.org/jira/browse/FLINK-8385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16318394#comment-16318394
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ASF GitHub Bot commented on FLINK-8385:
---------------------------------------
Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/5256
Thanks for the fast review @tillrohrmann ! I will address your comments and
merge.
> Fix exceptions in AbstractEventTimeWindowCheckpointingITCase
> ------------------------------------------------------------
>
> Key: FLINK-8385
> URL: https://issues.apache.org/jira/browse/FLINK-8385
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.4.0
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Fix For: 1.5.0
>
>
> When running all `AbstractEventTimeWindowCheckpointingITCase` with debug
> logging, I noticed two types of logged exceptions that should not happen:
> 1)
> {code}
> java.util.concurrent.RejectedExecutionException: Task
> org.apache.flink.runtime.state.SharedStateRegistry$AsyncDisposalRunnable@49258e6c
> rejected from java.util.concurrent.ThreadPoolExecutor@47e27938[Terminated,
> pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 24]
> at
> java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063)
> at
> java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830)
> at
> java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1379)
> at
> org.apache.flink.runtime.state.SharedStateRegistry.scheduleAsyncDelete(SharedStateRegistry.java:197)
> at
> org.apache.flink.runtime.state.SharedStateRegistry.unregisterReference(SharedStateRegistry.java:162)
> at
> org.apache.flink.runtime.state.IncrementalKeyedStateHandle.discardState(IncrementalKeyedStateHandle.java:180)
> at
> org.apache.flink.util.LambdaUtil.applyToAllWhileSuppressingExceptions(LambdaUtil.java:51)
> at
> org.apache.flink.runtime.state.StateUtil.bestEffortDiscardAllStateObjects(StateUtil.java:54)
> at
> org.apache.flink.runtime.checkpoint.OperatorSubtaskState.discardState(OperatorSubtaskState.java:187)
> at
> org.apache.flink.runtime.checkpoint.OperatorState.discardState(OperatorState.java:108)
> at
> org.apache.flink.util.LambdaUtil.applyToAllWhileSuppressingExceptions(LambdaUtil.java:51)
> at
> org.apache.flink.runtime.state.StateUtil.bestEffortDiscardAllStateObjects(StateUtil.java:54)
> at
> org.apache.flink.runtime.checkpoint.CompletedCheckpoint.doDiscard(CompletedCheckpoint.java:229)
> at
> org.apache.flink.runtime.checkpoint.CompletedCheckpoint.discardOnShutdown(CompletedCheckpoint.java:198)
> at
> org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore$2.apply(ZooKeeperCompletedCheckpointStore.java:351)
> at
> org.apache.flink.runtime.zookeeper.ZooKeeperStateHandleStore$RemoveBackgroundCallback.processResult(ZooKeeperStateHandleStore.java:640)
> at
> org.apache.curator.framework.imps.Backgrounding$1$1.run(Backgrounding.java:150)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> The cause of this exception is that disposal of an incremental state handle
> is triggered in another async thread and the shutdown proceeds to close the
> I/O Executor pool. This leads to RejectedExecutionException once the async
> deletes are triggered inside the registry. We need to wait for all pending ZK
> deletes before closing the I/O Executor pool.
> 2)
> {code}
> java.lang.Exception: Could not properly cancel managed keyed state future.
> at
> org.apache.flink.streaming.api.operators.OperatorSnapshotResult.cancel(OperatorSnapshotResult.java:91)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1090)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:685)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:621)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:574)
> at
> org.apache.flink.streaming.runtime.io.BarrierBuffer.notifyCheckpoint(BarrierBuffer.java:380)
> at
> org.apache.flink.streaming.runtime.io.BarrierBuffer.processBarrier(BarrierBuffer.java:230)
> at
> org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:185)
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:225)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:69)
> 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:748)
> Caused by: java.util.concurrent.CancellationException
> at java.util.concurrent.FutureTask.report(FutureTask.java:121)
> at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> at
> org.apache.flink.util.FutureUtil.runIfNotDoneAndGet(FutureUtil.java:43)
> at
> org.apache.flink.runtime.state.StateUtil.discardStateFuture(StateUtil.java:69)
> at
> org.apache.flink.streaming.api.operators.OperatorSnapshotResult.cancel(OperatorSnapshotResult.java:89)
> ... 12 more
> {code}
> This exception can be expected when the snapshot task is cancelled by closing
> the streams in blocking I/O. As an expected and safe exception, it should not
> be logged because it can easily confuse users.
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