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https://issues.apache.org/jira/browse/SPARK-18640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-18640.
---------------------------------
          Resolution: Fixed
       Fix Version/s: 2.1.0
                      2.0.3
    Target Version/s:   (was: 1.6.4, 2.0.3, 2.1.0, 2.2.0)

> 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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