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https://issues.apache.org/jira/browse/FLINK-20309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17238568#comment-17238568
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Arvid Heise commented on FLINK-20309:
-------------------------------------
I tracked down the issue to be related by duplicate splits, such that some
sources never finish while waiting for checkpoints to complete but some sources
already finished, so no new checkpoint would ever be created.
So it's "only" a test instability. I'm working with the source guys to see if
this could be related to their duplicates.
> UnalignedCheckpointTestBase.execute is failed
> ---------------------------------------------
>
> Key: FLINK-20309
> URL: https://issues.apache.org/jira/browse/FLINK-20309
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.12.0
> Reporter: Jark Wu
> Assignee: Arvid Heise
> Priority: Blocker
> Labels: test-stability
> Fix For: 1.12.0
>
>
> https://dev.azure.com/imjark/Flink/_build/results?buildId=345&view=logs&j=0a15d512-44ac-5ba5-97ab-13a5d066c22c&t=634cd701-c189-5dff-24cb-606ed884db87
> {code}
> [ERROR] Failures:
> [ERROR]
> org.apache.flink.test.checkpointing.UnalignedCheckpointITCase.execute[Parallel
> cogroup, p =
> 10](org.apache.flink.test.checkpointing.UnalignedCheckpointITCase)
> [ERROR] Run 1:
> UnalignedCheckpointITCase.execute:153->UnalignedCheckpointTestBase.execute:123
> NUM_OUT_OF_ORDER
> Expected: <0L>
> but: was <10063L>
> [ERROR] Run 2:
> UnalignedCheckpointITCase.execute:153->UnalignedCheckpointTestBase.execute:125
> NUM_LOST
> Expected: <0L>
> but: was <10037L>
> [INFO]
> [INFO]
> [ERROR] Tests run: 1592, Failures: 1, Errors: 0, Skipped: 44
> {code}
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