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https://issues.apache.org/jira/browse/SPARK-2634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071317#comment-14071317
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Apache Spark commented on SPARK-2634:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/1541
> MapOutputTrackerWorker.mapStatuses should be thread-safe
> --------------------------------------------------------
>
> Key: SPARK-2634
> URL: https://issues.apache.org/jira/browse/SPARK-2634
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: Shixiong Zhu
> Labels: easyfix
>
> MapOutputTrackerWorker.mapStatuses will be used concurrently, so it should be
> a thread-safe Map.
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