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https://issues.apache.org/jira/browse/FLINK-35722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17860782#comment-17860782
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Matthias Pohl commented on FLINK-35722:
---------------------------------------
We touched checkpointing as part of FLINK-35552. Only the
CheckpointStatsTracker is modified and the main changes happen in the
{{AdaptiveScheduler}}, though. The test failure happened with the
{{DefaultScheduler}} being utilized.
Moving the {{CheckpointStatsTracker}] out of the
{{DefaultExecutionGraphBuilder}} into the {{Scheduler}} should have this kind
of impact. I was neither able to reproduce the issue locally.
That's why I am suspecting the test stability being unrelated to the
FLINK-35552 change.
> CoordinatorEventsToStreamOperatorRecipientExactlyOnceITCase.testCheckpoint
> fails because of missed operator event
> -----------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-35722
> URL: https://issues.apache.org/jira/browse/FLINK-35722
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 2.0.0, 1.20.0
> Reporter: Matthias Pohl
> Priority: Major
> Labels: test-stability
> Attachments: FLINK-35552.testCheckpoint.log,
> logs-ci-test_ci_core-1719524892.zip
>
>
> A test instability in
> {{CoordinatorEventsToStreamOperatorRecipientExactlyOnceITCase.testCheckpoint}}
> was observed where an expected {{OperatorEvent}} was missed:
> {code:java}
> Test
> org.apache.flink.streaming.runtime.tasks.CoordinatorEventsToStreamOperatorRecipientExactlyOnceITCase.testCheckpoint[testCheckpoint()]
> failed with:
> java.lang.AssertionError:
> Expecting actual:
> [0,
> 1,
> 3,
> 4,
> [...]
> 98,
> 99]
> to contain exactly (and in same order):
> [0,
> 1,
> 2,
> 3,
> 4,
> [...]
> but could not find the following elements:
> [2] at
> org.apache.flink.runtime.operators.coordination.CoordinatorEventsExactlyOnceITCase.checkListContainsSequence(CoordinatorEventsExactlyOnceITCase.java:175)
> at
> org.apache.flink.streaming.runtime.tasks.CoordinatorEventsToStreamOperatorRecipientExactlyOnceITCase.executeAndVerifyResults(CoordinatorEventsToStreamOperatorRecipientExactlyOnceITCase.java:178)
> at
> org.apache.flink.streaming.runtime.tasks.CoordinatorEventsToStreamOperatorRecipientExactlyOnceITCase.testCheckpoint(CoordinatorEventsToStreamOperatorRecipientExactlyOnceITCase.java:124)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) {code}
> The [build
> failure|https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=60530&view=logs&j=0da23115-68bb-5dcd-192c-bd4c8adebde1&t=24c3384f-1bcb-57b3-224f-51bf973bbee8]
> happened on commit
> [2e853ce39a|https://github.com/flink-ci/flink/commit/2e853ce39aa2db8212402de3dcc0f049397887fd]
> for FLINK-35552.
> I attached the logs for further relevant build artifact and the extract logs
> for this specific test failure.
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