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https://issues.apache.org/jira/browse/SPARK-18640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15707265#comment-15707265
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Apache Spark commented on SPARK-18640:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/16073
> 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
>
> The method TaskSchedulerImpl.runningTasksByExecutors() accesses the mutable
> executorIdToRunningTaskIds map without proper synchronization. We should fix
> this.
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