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[jira] [Created] (FLINK-10844) ArrayIndexOutOfBoundsException during checkpoint (Flink 1.5.2)


Daniel Harper created FLINK-10844:
-------------------------------------

             Summary: 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


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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