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https://issues.apache.org/jira/browse/SPARK-24926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen reassigned SPARK-24926:
---------------------------------

    Assignee: Nihar Sheth  (was: Imran Rashid)

> 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
>            Assignee: Nihar Sheth
>            Priority: Major
>              Labels: memory-analysis
>             Fix For: 2.4.0
>
>
> 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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