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https://issues.apache.org/jira/browse/SPARK-16972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413276#comment-15413276
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Apache Spark commented on SPARK-16972:
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User 'lshmouse' has created a pull request for this issue:
https://github.com/apache/spark/pull/14561

> Move DriverEndpoint out of CoarseGrainedSchedulerBackend
> --------------------------------------------------------
>
>                 Key: SPARK-16972
>                 URL: https://issues.apache.org/jira/browse/SPARK-16972
>             Project: Spark
>          Issue Type: Improvement
>          Components: Scheduler
>    Affects Versions: 2.0.0
>            Reporter: Liu Shaohui
>
> The CoarseGrainedSchedulerBackend class is too large and complex to 
> understand or make improvements, because it contains an inner class 
> DriverEndpoint and many members of CoarseGrainedSchedulerBackend are used in 
> DriverEndpoint.
> So I am trying to move DriverEndpoint out of CoarseGrainedSchedulerBackend 
> and make these two classes clean and easy to understand.



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