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https://issues.apache.org/jira/browse/FLINK-20654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17340073#comment-17340073
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Piotr Nowojski commented on FLINK-20654:
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[~mapohl] and [~trohrmann], could you elaborate what's the problem exactly? Why
do you need to analyse UCITcase/UCStressITCase/UCRescaingITCase logs?
> Unaligned checkpoint recovery may lead to corrupted data stream
> ---------------------------------------------------------------
>
> Key: FLINK-20654
> URL: https://issues.apache.org/jira/browse/FLINK-20654
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.12.0, 1.12.1
> Reporter: Arvid Heise
> Assignee: Piotr Nowojski
> Priority: Critical
> Labels: pull-request-available, test-stability
> Fix For: 1.13.0, 1.12.3
>
>
> Fix of FLINK-20433 shows potential corruption after recovery for all
> variations of UnalignedCheckpointITCase.
> To reproduce, run UCITCase a couple hundreds times. The issue showed for me
> in:
> - execute [Parallel union, p = 5]
> - execute [Parallel union, p = 10]
> - execute [Parallel cogroup, p = 5]
> - execute [parallel pipeline with remote channels, p = 5]
> with decreasing frequency.
> The issue manifests as one of the following issues:
> - stream corrupted exception
> - EOF exception
> - assertion failure in NUM_LOST or NUM_OUT_OF_ORDER
> - (for union) ArithmeticException overflow (because the number that should be
> [0;100000] has been mis-deserialized)
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