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https://issues.apache.org/jira/browse/KAFKA-16774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17846940#comment-17846940
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Bruno Cadonna commented on KAFKA-16774:
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[~chia7712] Thank you for your analysis! Without looking at your comment, I
came to the same conclusion about the cause of the flakiness. I was puzzled at
first because {{allTasks()}} should only be called by the stream thread, so I
did not understand were the concurrency comes from. Then I took a closer look
at the test and then I saw that the stream thread is started in the test which
explains the concurrency.
> fix flaky StreamThreadTest#shouldCloseAllTaskProducersOnCloseIfEosEnabled
> -------------------------------------------------------------------------
>
> Key: KAFKA-16774
> URL: https://issues.apache.org/jira/browse/KAFKA-16774
> Project: Kafka
> Issue Type: Test
> Components: streams, unit tests
> Reporter: Chia-Ping Tsai
> Priority: Minor
> Labels: flaky-test
>
> java.util.ConcurrentModificationException
> at
> java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1720)
> at
> java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
> at
> java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
> at
> java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
> at
> java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
> at
> org.apache.kafka.streams.processor.internals.TaskManager.allTasks(TaskManager.java:1686)
> at
> org.apache.kafka.streams.processor.internals.TaskManager.releaseLockedUnassignedTaskDirectories(TaskManager.java:1364)
> at
> org.apache.kafka.streams.processor.internals.TaskManager.handleRebalanceComplete(TaskManager.java:208)
> at
> org.apache.kafka.streams.processor.internals.StreamsRebalanceListener.onPartitionsAssigned(StreamsRebalanceListener.java:79)
> at
> org.apache.kafka.streams.processor.internals.StreamThreadTest.shouldCloseAllTaskProducersOnCloseIfEosEnabled(StreamThreadTest.java:1408)
> at
> java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
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