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https://issues.apache.org/jira/browse/SPARK-29398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Imran Rashid resolved SPARK-29398.
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    Fix Version/s: 3.0.0
         Assignee: Marcelo Masiero Vanzin
       Resolution: Fixed

Resolved by https://github.com/apache/spark/pull/26059

> Allow RPC endpoints to use dedicated thread pools
> -------------------------------------------------
>
>                 Key: SPARK-29398
>                 URL: https://issues.apache.org/jira/browse/SPARK-29398
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Spark Core
>    Affects Versions: 3.0.0
>            Reporter: Marcelo Masiero Vanzin
>            Assignee: Marcelo Masiero Vanzin
>            Priority: Major
>             Fix For: 3.0.0
>
>
> This is a new feature of the RPC framework so that we can isolate RPC message 
> delivery for plugins from normal Spark RPC needs. This minimizes the impact 
> that plugins can have on normal RPC communication - they'll still fight for 
> CPU, but they wouldn't block the dispatcher threads used by existing Spark 
> RPC endpoints.
> See parent bug for further details.



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