Matthias Pohl created FLINK-35722:
-------------------------------------

             Summary: 
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


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 investigation.



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