DanielLeens commented on PR #12305:
URL: https://github.com/apache/seatunnel/pull/12305#issuecomment-5812778665

   One small addendum to the CI diagnosis in my review above: I described 
`engine-v2-it (8, ubuntu-latest)`'s failure (`SplitClusterFaultToleranceIT`) 
but did not separately call out `engine-v2-it (11, ubuntu-latest)`, which 
actually fails on a different test: 
`CheckpointCoordinatorFailoverIT.testStreamJobFailsAfterCheckpointTriggerDispatchFailure`
 — an `AssertionFailedError` where the job failure got attributed to 
`CheckpointException: Checkpoint notify complete failed` instead of the 
expected `CHECKPOINT_INSIDE_ERROR` path via 
`CheckpointCoordinator#handleCoordinatorError`. This is a timing-dependent race 
between two failure-attribution paths inside 
`CheckpointCoordinator`/`EventService` (I also see a benign 
`NullPointerException: Target cannot be null!` in `EventService`'s async 
event-forwarder during node shutdown in the surrounding log, consistent with a 
shutdown-ordering race rather than a bug in this PR's diff). This PR touches no 
checkpoint-coordinator or event-service code
 , so this does not change my merge recommendation or overall assessment — just 
correcting the CI diagnosis to be complete and accurate rather than leaving 
that job uncharacterized.


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