Wenchen Fan resolved SPARK-30623.
    Fix Version/s: 3.0.0
       Resolution: Fixed

Issue resolved by pull request 27665

> 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: 3.0.0
>            Reporter: Thomas Graves
>            Priority: Major
>             Fix For: 3.0.0
> In SPARK-24355 changes were made to add a separate event loop group for 
> processing ChunkFetchRequests , thisĀ  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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