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https://issues.apache.org/jira/browse/SPARK-43987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mridul Muralidharan resolved SPARK-43987.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 41489
[https://github.com/apache/spark/pull/41489]
> Separate finalizeShuffleMerge Processing to Dedicated Thread Pools
> ------------------------------------------------------------------
>
> Key: SPARK-43987
> URL: https://issues.apache.org/jira/browse/SPARK-43987
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Affects Versions: 3.2.0, 3.4.0
> Reporter: SHU WANG
> Assignee: SHU WANG
> Priority: Critical
> Fix For: 4.0.0
>
>
> In our production environment, _finalizeShuffleMerge_ processing took longer
> time (p90 is around 20s) than other PRC requests. This is due to
> _finalizeShuffleMerge_ invoking IO operations like truncate and file
> open/close.
> More importantly, processing this _finalizeShuffleMerge_ can block other
> critical lightweight messages like authentications, which can cause
> authentication timeout as well as fetch failures. Those timeout and fetch
> failures affect the stability of the Spark job executions.
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