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https://issues.apache.org/jira/browse/BEAM-14265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525890#comment-17525890
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Kenneth Knowles commented on BEAM-14265:
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Does it ignore the value (a data correctness bug) or does it reject the 
pipeline or fail at runtime?

> Flink should hold the watermark at the output timestamp for processing time 
> timers
> ----------------------------------------------------------------------------------
>
>                 Key: BEAM-14265
>                 URL: https://issues.apache.org/jira/browse/BEAM-14265
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>            Reporter: Steve Niemitz
>            Priority: P2
>
> Currently the Flink runner doesn't support output timestamps on processing 
> time timers, and instead uses the current output watermark when the timer 
> fires.
> We should update the runner to correctly set a watermark hold at the output 
> timestamp and use it when firing the timer.



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