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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/06/04 15:27:40 UTC

[GitHub] [beam] damccorm opened a new issue, #20096: Optimize state cleanup at end-of-window

damccorm opened a new issue, #20096:
URL: https://github.com/apache/beam/issues/20096

   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.
   
   Imported from Jira [BEAM-9308](https://issues.apache.org/jira/browse/BEAM-9308). Original Jira may contain additional context.
   Reported by: SteveNiemitz.


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