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https://issues.apache.org/jira/browse/FLINK-20654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17256704#comment-17256704
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Roman Khachatryan commented on FLINK-20654:
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The fixes above were also merged to release-1.12 as d61a36...026a86.
As for the failures, the first one is FLINK-20781, but the second one is again
IOException in co-group (thanks for reporting them!)
I think we can leave the test enabled (without union) as failure rate should be
low.
> 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
> Reporter: Arvid Heise
> Assignee: Roman Khachatryan
> Priority: Critical
> Labels: pull-request-available, test-stability
> Fix For: 1.13.0, 1.12.1
>
>
> 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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