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https://issues.apache.org/jira/browse/SPARK-18640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15715690#comment-15715690
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Josh Rosen commented on SPARK-18640:
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I'm also going to backport this into branch-1.6.
> Fix minor synchronization issue in TaskSchedulerImpl.runningTasksByExecutors
> ----------------------------------------------------------------------------
>
> Key: SPARK-18640
> URL: https://issues.apache.org/jira/browse/SPARK-18640
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Minor
> Fix For: 2.0.3, 2.1.0
>
>
> The method TaskSchedulerImpl.runningTasksByExecutors() accesses the mutable
> executorIdToRunningTaskIds map without proper synchronization. We should fix
> this.
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