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https://issues.apache.org/jira/browse/FLINK-10844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691558#comment-16691558
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Daniel Harper commented on FLINK-10844:
---------------------------------------
Hi Stefan, thank you for your reply, I'm not sure if I fully understand.
We've seen this a few times now, we are using Beam 2.7.0 and Flink 1.5.2
Would you see this as an issue with our code (e.g. not implementing
equals/hashcode correctly in our objects) or a in issue with BEAM?
> ArrayIndexOutOfBoundsException during checkpoint (Flink 1.5.2)
> --------------------------------------------------------------
>
> Key: FLINK-10844
> URL: https://issues.apache.org/jira/browse/FLINK-10844
> Project: Flink
> Issue Type: Improvement
> Components: Core
> Environment: Flink 1.5.2
> AWS EMR 5.17.0
> Reporter: Daniel Harper
> Priority: Minor
>
> We have seen this exception a few times in our production environment during
> checkpoints, which causes the job to restart
> {code}
> AsynchronousException{java.lang.Exception: Could not materialize checkpoint
> 2426 for operator
> x.x.x.x.streaming.pipeline.transformations.concurrentstreams.ConcurrentStreamsAggregator
> PERFORM COUNT DISTINCT OVER UUIDS FOR KEY ->
> ParDo(ToConcurrentStreamsResult)/ParMultiDo(ToConcurrentStreamsResult) ->
> JdbcIO.Write/ParDo(Write)/ParMultiDo(Write) (28/32).}
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointExceptionHandler.tryHandleCheckpointException(StreamTask.java:1154)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.handleExecutionException(StreamTask.java:948)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.run(StreamTask.java:885)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.Exception: Could not materialize checkpoint 2426 for
> operator
> x.x.x.x.streaming.pipeline.transformations.concurrentstreams.ConcurrentStreamsAggregator
> PERFORM COUNT DISTINCT OVER UUIDS FOR KEY ->
> ParDo(ToConcurrentStreamsResult)/ParMultiDo(ToConcurrentStreamsResult) ->
> JdbcIO.Write/ParDo(Write)/ParMultiDo(Write) (28/32).
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.handleExecutionException(StreamTask.java:943)
> ... 6 more
> Caused by: java.util.concurrent.ExecutionException:
> java.lang.ArrayIndexOutOfBoundsException: -22
> at java.util.concurrent.FutureTask.report(FutureTask.java:122)
> at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> at
> org.apache.flink.util.FutureUtil.runIfNotDoneAndGet(FutureUtil.java:53)
> at
> org.apache.flink.streaming.api.operators.OperatorSnapshotFinalizer.<init>(OperatorSnapshotFinalizer.java:47)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.run(StreamTask.java:854)
> ... 5 more
> Caused by: java.lang.ArrayIndexOutOfBoundsException: -22
> at
> org.apache.flink.runtime.state.heap.CopyOnWriteStateTableSnapshot.partitionEntriesByKeyGroup(CopyOnWriteStateTableSnapshot.java:162)
> at
> org.apache.flink.runtime.state.heap.CopyOnWriteStateTableSnapshot.writeMappingsInKeyGroup(CopyOnWriteStateTableSnapshot.java:178)
> at
> org.apache.flink.runtime.state.heap.HeapKeyedStateBackend$HeapSnapshotStrategy$1.performOperation(HeapKeyedStateBackend.java:697)
> at
> org.apache.flink.runtime.state.heap.HeapKeyedStateBackend$HeapSnapshotStrategy$1.performOperation(HeapKeyedStateBackend.java:641)
> at
> org.apache.flink.runtime.io.async.AbstractAsyncCallableWithResources.call(AbstractAsyncCallableWithResources.java:75)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> org.apache.flink.util.FutureUtil.runIfNotDoneAndGet(FutureUtil.java:50)
> ... 7 more
> {code}
> Looks like the index being computed here:
> https://github.com/apache/flink/blob/release-1.5.2/flink-runtime/src/main/java/org/apache/flink/runtime/state/heap/CopyOnWriteStateTableSnapshot.java#L161
> Is returning -22, causing the AOOB exception to fire
> https://github.com/apache/flink/blob/release-1.5.2/flink-runtime/src/main/java/org/apache/flink/runtime/state/heap/CopyOnWriteStateTableSnapshot.java#L162
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