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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/05/06 16:59:00 UTC
[jira] [Work logged] (BEAM-9308) Optimize state cleanup at
end-of-window
[ https://issues.apache.org/jira/browse/BEAM-9308?focusedWorklogId=431314&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-431314 ]
ASF GitHub Bot logged work on BEAM-9308:
----------------------------------------
Author: ASF GitHub Bot
Created on: 06/May/20 16:58
Start Date: 06/May/20 16:58
Worklog Time Spent: 10m
Work Description: stale[bot] commented on pull request #10852:
URL: https://github.com/apache/beam/pull/10852#issuecomment-624768356
This pull request has been closed due to lack of activity. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.
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Issue Time Tracking
-------------------
Worklog Id: (was: 431314)
Time Spent: 2h (was: 1h 50m)
> 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
> Assignee: Steve Niemitz
> Priority: Major
> 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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