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https://issues.apache.org/jira/browse/SPARK-15913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15326867#comment-15326867
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Apache Spark commented on SPARK-15913:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/13634
> Dispatcher.stopped should be enclosed by synchronized block.
> ------------------------------------------------------------
>
> Key: SPARK-15913
> URL: https://issues.apache.org/jira/browse/SPARK-15913
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Dongjoon Hyun
>
> Dispatcher.stopped is guarded by `this`, but it is used without
> synchronization in `postMessage` function. This issue fixes this.
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