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https://issues.apache.org/jira/browse/SPARK-24926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558688#comment-16558688
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Apache Spark commented on SPARK-24926:
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User 'NiharS' has created a pull request for this issue:
https://github.com/apache/spark/pull/21885
> Ensure numCores is used consistently in all netty configuration (driver and
> executors)
> --------------------------------------------------------------------------------------
>
> Key: SPARK-24926
> URL: https://issues.apache.org/jira/browse/SPARK-24926
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.4.0
> Reporter: Imran Rashid
> Priority: Major
> Labels: memory-analysis
>
> I think there may be some places where we're not passing the right number of
> configured cores to netty -- in particular in driver mode, we're not
> respecting "spark.driver.cores". This means that spark will configure netty
> will be configured based on the number of physical cores of the device,
> instead of whatever resources spark requested from the cluster manager. It
> controls both the number of threads netty uses *and* the number of arenas in
> its memory pools.
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