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https://issues.apache.org/jira/browse/SPARK-11252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14969375#comment-14969375
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Apache Spark commented on SPARK-11252:
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User 'lianhuiwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/9227
> ExternalShuffleClient should release connection after it had completed to
> fetch blocks from yarn's NameManager
> --------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-11252
> URL: https://issues.apache.org/jira/browse/SPARK-11252
> Project: Spark
> Issue Type: Bug
> Components: Shuffle, YARN
> Reporter: Lianhui Wang
>
> ExternalShuffleClient of executors reserve its connection with yarn's
> NodeManager until application has been completed. so it will make NodeManager
> has many socket connections.
> in order to reduce network pressure of NodeManager's shuffleService, after
> registerWithShuffleServer or fetchBlocks have been completed in
> ExternalShuffleClient, connection for shuffleService needs to be closed.
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