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https://issues.apache.org/jira/browse/SPARK-17314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15449670#comment-15449670
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Apache Spark commented on SPARK-17314:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/14879

> Use Netty's DefaultThreadFactory to enable its fast ThreadLocal impl
> --------------------------------------------------------------------
>
>                 Key: SPARK-17314
>                 URL: https://issues.apache.org/jira/browse/SPARK-17314
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Shixiong Zhu
>            Assignee: Shixiong Zhu
>            Priority: Minor
>
> Netty will use its fast ThreadLocal implementation when a thread is a 
> FastThreadLocalThread. This patch just switches to Netty's 
> DefaultThreadFactory to trigger it.



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