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https://issues.apache.org/jira/browse/SPARK-25641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17068232#comment-17068232
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Dongjoon Hyun commented on SPARK-25641:
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This commit is technically reverted via SPARK-30623 .
> Change the spark.shuffle.server.chunkFetchHandlerThreadsPercent default to 100
> ------------------------------------------------------------------------------
>
> Key: SPARK-25641
> URL: https://issues.apache.org/jira/browse/SPARK-25641
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.4.0
> Reporter: Sanket Reddy
> Assignee: Sanket Reddy
> Priority: Minor
> Fix For: 3.0.0
>
>
> We want to change the default percentage to 100 for
> spark.shuffle.server.chunkFetchHandlerThreadsPercent. The reason being
> currently this is set to 0. Which means currently if server.ioThreads > 0,
> the default number of threads would be 2 * #cores instead of
> server.io.Threads. We want the default to server.io.Threads in case this is
> not set at all. Also here a default of 0 would also mean 2 * #cores
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