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https://issues.apache.org/jira/browse/SPARK-30623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17067359#comment-17067359
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Dongjoon Hyun commented on SPARK-30623:
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Hi, [~tgraves]. Since SPARK-24355 is fixed at 3.0.0, I removed `2.4.4` from the
`Affected Version`. Please let me know if I'm wrong.
> Spark external shuffle allow disable of separate event loop group
> -----------------------------------------------------------------
>
> Key: SPARK-30623
> URL: https://issues.apache.org/jira/browse/SPARK-30623
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Affects Versions: 2.4.4, 3.0.0
> Reporter: Thomas Graves
> Priority: Major
>
> In SPARK-24355 changes were made to add a separate event loop group for
> processing ChunkFetchRequests , this allow fors the other threads to handle
> regular connection requests when the configuration value is set. This however
> seems to have added some latency (see pr 22173 comments at the end).
> To help with this we could make sure the secondary event loop group isn't
> used when the configuration of
> spark.shuffle.server.chunkFetchHandlerThreadsPercent isn't explicitly set.
> This should result in getting the same behavior as before.
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