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https://issues.apache.org/jira/browse/BEAM-9573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17065105#comment-17065105
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Maximilian Michels commented on BEAM-9573:
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Thank you for your patience!
> Watermark hold for timer output timestamp is not computed correctly
> -------------------------------------------------------------------
>
> Key: BEAM-9573
> URL: https://issues.apache.org/jira/browse/BEAM-9573
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Affects Versions: 2.20.0
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: Blocker
> Fix For: 2.20.0
>
>
> With the introduction of timer output timestamp, a new watermark hold had
> been added to the Flink Runner. The watermark computation works on the keyed
> state backend which computes a key-scoped watermark hold and not the desired
> operator-wide watermark hold.
> Computation:
> https://github.com/apache/beam/blob/b564239081e9351c56fb0e7d263495b95dd3f8f3/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/DoFnOperator.java#L1140
> Key-scoped state:
> https://github.com/apache/beam/blob/b564239081e9351c56fb0e7d263495b95dd3f8f3/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/DoFnOperator.java#L1130
> We need to change this to operate on all keys. This has to be done before
> fixing BEAM-9566.
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