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https://issues.apache.org/jira/browse/BEAM-14265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525916#comment-17525916
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Steve Niemitz commented on BEAM-14265:
--------------------------------------

The output timestamp is ignored yes.  I was hesitant to make this a P1 because 
it seems like it's always been like this, although new validation added to 
outputs from timestamps made it more noticeable that the timestamp was 
incorrect.

> 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: P1
>
> 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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