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https://issues.apache.org/jira/browse/BEAM-6116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16696172#comment-16696172
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Thomas Weise commented on BEAM-6116:
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[~chamikara] The fix should also go to the 2.9 release branch since this is a
correctness issue.
[~mxm] Since none of our tests could catch this (final watermark gets special
treatment), it would be good to add a unit test that exercises the push back
scenario without final watermark.
> Pushed back watermark never emitted in portable Flink runner
> ------------------------------------------------------------
>
> Key: BEAM-6116
> URL: https://issues.apache.org/jira/browse/BEAM-6116
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Affects Versions: 2.9.0
> Reporter: Thomas Weise
> Assignee: Thomas Weise
> Priority: Critical
> Labels: portability-flink
> Fix For: 2.9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> The portable runner pushes back the watermark while the bundle processes in
> the SDK worker. After the bundle is complete, that watermark needs to be
> emitted. That never happens, because ExecutableStageDoFnOperator does not
> clear the hold.
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