[jira] [Updated] (BEAM-7574) Spark runner: Combine.perKey performance issues

["Jan Lukavský (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-7574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jan Lukavský updated BEAM-7574:
-------------------------------
    Status: Open  (was: Triage Needed)

> Spark runner: Combine.perKey performance issues
> -----------------------------------------------
>
>                 Key: BEAM-7574
>                 URL: https://issues.apache.org/jira/browse/BEAM-7574
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-spark
>    Affects Versions: 2.13.0
>            Reporter: Jan Lukavský
>            Assignee: Jan Lukavský
>            Priority: Major
>
> Combine.perKey on current implementation uses technique of creating an accumulator for each input key and then merge all these accumulators together. Optimize this by:
>  * changing accumulator from Iterable to Map, and using addInput as much as possible
>  * try to move the window explode to pre-shuffle (add window label to key for non-merging windows), measure the impact, and if the impact is substantial, implement that for at leasit window functions assigning to single (global) window or single window per element (tumbling windows)



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