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Posted to issues@beam.apache.org by "Beam JIRA Bot (Jira)" <ji...@apache.org> on 2020/08/10 17:07:13 UTC

[jira] [Updated] (BEAM-9308) Optimize state cleanup at end-of-window

     [ https://issues.apache.org/jira/browse/BEAM-9308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Beam JIRA Bot updated BEAM-9308:
--------------------------------
    Labels: stale-P2  (was: )

> Optimize state cleanup at end-of-window
> ---------------------------------------
>
>                 Key: BEAM-9308
>                 URL: https://issues.apache.org/jira/browse/BEAM-9308
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-dataflow
>            Reporter: Steve Niemitz
>            Priority: P2
>              Labels: stale-P2
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> When using state with a large keyspace, you can end up with a large amount of state cleanup timers set to fire all 1ms after the end of a window.  This can cause a momentary (I've observed 1-3 minute) lag in processing while windmill and the java harness fire and process these cleanup timers.
> By spreading the firing over a short period after the end of the window, we can decorrelate the firing of the timers and smooth the load out, resulting in much less impact from state cleanup.



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