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https://issues.apache.org/jira/browse/BEAM-24?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17132190#comment-17132190
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Beam JIRA Bot commented on BEAM-24:
-----------------------------------

This issue is P2 but has been unassigned without any comment for 60 days so it 
has been labeled "stale-P2". If this issue is still affecting you, we care! 
Please comment and remove the label. Otherwise, in 14 days the issue will be 
moved to P3.

Please see https://beam.apache.org/contribute/jira-priorities/ for a detailed 
explanation of what these priorities mean.


> Merging of watermark holds depends on runner-specific "take the minimum" 
> behavior
> ---------------------------------------------------------------------------------
>
>                 Key: BEAM-24
>                 URL: https://issues.apache.org/jira/browse/BEAM-24
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-core
>            Reporter: Kenneth Knowles
>            Priority: P2
>              Labels: stale-P2
>
> When multiple watermark holds are to be combined via an OutputTimeFn and 
> committed to persistent storage, the case where the OutputTimeFn computes the 
> minimum is elided, assuming the underlying runner will perform this combine 
> by default.
> This is a natural default, but today it is a runner-specific behavior that 
> the runner-agnostic code relies upon.



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