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https://issues.apache.org/jira/browse/FLINK-40793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18129133#comment-18129133
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Martijn Visser commented on FLINK-40793:
----------------------------------------

Five more, two of them on methods not in the list yet 
(cancelWhileRestartingShouldWaitForRunningTasks, 
testTaskFailureWithFailureEnricherLabels):
https://github.com/apache/flink/actions/runs/38195297569/job/114649148998 
(release-2.3, nightly 2026-10-12, Hadoop 3.1.3, JDK 17, two methods)
https://github.com/apache/flink/actions/runs/38336045675/job/115100520225 
(master, nightly 2026-10-13, AdaptiveScheduler, JDK 17)
https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=80086&view=logs&j=77a9d8e1-d610-59b3-fc2a-4766541e0e33
 (master, nightly 2026-10-13, test_cron_azure core, JDK 17)
https://github.com/apache/flink/actions/runs/38499055849/job/115660198369 
(release-2.3, nightly 2026-10-14, Java 21)
https://github.com/apache/flink/actions/runs/39187400189/job/117862311890 
(release-2.3, push 2026-10-19, Java 17, two methods)

{code}
[ERROR] 
org.apache.flink.runtime.scheduler.DefaultSchedulerTest.cancelWhileRestartingShouldWaitForRunningTasks
 -- Time elapsed: 0.019 s <<< FAILURE!
org.opentest4j.AssertionFailedError:
expected: CANCELING
 but was: FAILED
        at 
org.apache.flink.runtime.scheduler.DefaultSchedulerTest.cancelWhileRestartingShouldWaitForRunningTasks(DefaultSchedulerTest.java:1112)
{code}

{code}
[ERROR] 
org.apache.flink.runtime.scheduler.DefaultSchedulerTest.testExceptionHistoryConcurrentRestart
 -- Time elapsed: 0.126 s <<< ERROR!
java.lang.IllegalStateException: A root exception entry should exist if 
failureHandlingResult wasn't generated as part of a new error handling cycle.
        at 
org.apache.flink.runtime.scheduler.SchedulerBase.archiveFromFailureHandlingResult(SchedulerBase.java:776)
        at 
org.apache.flink.runtime.scheduler.DefaultScheduler.restartTasksWithDelay(DefaultScheduler.java:385)
{code}

That is three in the last seven days, so I'd raise this to Critical. PR #29278 
is still waiting for a committer.

> DefaultSchedulerTest is unstable across many test methods
> ---------------------------------------------------------
>
>                 Key: FLINK-40793
>                 URL: https://issues.apache.org/jira/browse/FLINK-40793
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Coordination
>    Affects Versions: 2.2.2, 2.3.1, 2.4.0
>            Reporter: sepuri sai krishna
>            Assignee: sepuri sai krishna
>            Priority: Major
>              Labels: pull-request-available, test-stability
>
> DefaultSchedulerTest failed 17 times in the 90 days to 2026-09-15, in 11 
> different test methods, on all core CI profiles (Java 11, 17, 21, Hadoop, 
> AdaptiveScheduler). It is not limited to master: the most recent two are 
> 2026-09-14 on master and 2026-09-10 on release-2.3.
> Recent runs:
> * https://github.com/apache/flink/actions/runs/34798011374/job/103837976051 
> master, testExceptionHistoryWithRestartableFailure
> * https://github.com/apache/flink/actions/runs/34427845031/job/102726173515 
> release-2.3, testExceptionHistoryWithRestartableFailure
> * https://github.com/apache/flink/actions/runs/33866786819/job/101007980019 
> testExceptionHistoryConcurrentRestart
> * https://github.com/apache/flink/actions/runs/33349433782/job/99360730245 
> testJobStatusHookWithJobCanceled
> * https://github.com/apache/flink/actions/runs/32136151763/job/95710148170 
> testExceptionHistoryWithGlobalFailOver
> * https://github.com/apache/flink/actions/runs/31662007213/job/94339220821 
> testJobStatusHookWithJobFinished
> * https://github.com/apache/flink/actions/runs/30418270959/job/90470994165 
> testStartCheckpointOnlyAfterVertexWithBlockingEdgeFinished
> Other failing methods: skipDeploymentIfVertexVersionOutdated, 
> testDeploymentWaitForProducedPartitionRegistration, 
> failGlobalWhenRestoringStateFails, 
> jobStatusIsRestartingIfOneVertexIsWaitingForRestart, 
> abortPendingCheckpointsWhenRestartingTasks.
> {code}
> [ERROR] 
> org.apache.flink.runtime.scheduler.DefaultSchedulerTest.testJobStatusHookWithJobCanceled
>  -- Time elapsed: 0.014 s <<< FAILURE!
> org.opentest4j.AssertionFailedError:
> expected: CANCELED
>  but was: FAILED
>       at 
> org.apache.flink.runtime.scheduler.DefaultSchedulerTest.commonJobStatusHookTest(DefaultSchedulerTest.java:1933)
>       at 
> org.apache.flink.runtime.scheduler.DefaultSchedulerTest.testJobStatusHookWithJobCanceled(DefaultSchedulerTest.java:1818)
> {code}
> {code}
> [ERROR] 
> org.apache.flink.runtime.scheduler.DefaultSchedulerTest.testStartCheckpointOnlyAfterVertexWithBlockingEdgeFinished
>  -- Time elapsed: 0.026 s <<< ERROR!
> java.lang.IllegalStateException
>       at 
> org.apache.flink.util.Preconditions.checkState(Preconditions.java:177)
>       at 
> org.apache.flink.runtime.scheduler.DefaultSchedulerTest.transitionToRunning(DefaultSchedulerTest.java:2362)
>       at 
> org.apache.flink.runtime.scheduler.DefaultSchedulerTest.testStartCheckpointOnlyAfterVertexWithBlockingEdgeFinished(DefaultSchedulerTest.java:1877)
> {code}



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