[jira] [Commented] (BEAM-2402) Support AfterPane.elementGapAtMost() trigger and its combination with elementCountAtLeast()

["Beam JIRA Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-2402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17179880#comment-17179880 ] 

Beam JIRA Bot commented on BEAM-2402:
-------------------------------------

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.


> Support AfterPane.elementGapAtMost() trigger and its combination with elementCountAtLeast()
> -------------------------------------------------------------------------------------------
>
>                 Key: BEAM-2402
>                 URL: https://issues.apache.org/jira/browse/BEAM-2402
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-core
>            Reporter: Pei He
>            Priority: P2
>              Labels: stale-P2
>
> We need a timestamp-driven trigger to use as a cheaper (or more efficient) version of the ProcessingTime trigger.
> The problem of using ProcessingTime trigger is that current runners' supports are not very efficient, and couldn't work for pipelines that have lots of keys (for example, flink runner will scan timers for all keys when watermark advance).
> We have used AfterPane.elementGapAtMost() trigger in our production, and want to merge it back. And, we believe it could be the solution for people who have the similar issue.
> Implementation for reference:
> https://github.com/apache/beam/compare/master...peihe:custom-after-pane?expand=1



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