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https://issues.apache.org/jira/browse/SPARK-8029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14968437#comment-14968437
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Apache Spark commented on SPARK-8029:
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User 'squito' has created a pull request for this issue:
https://github.com/apache/spark/pull/9214
> ShuffleMapTasks must be robust to concurrent attempts on the same executor
> --------------------------------------------------------------------------
>
> Key: SPARK-8029
> URL: https://issues.apache.org/jira/browse/SPARK-8029
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.4.0
> Reporter: Imran Rashid
> Assignee: Imran Rashid
> Priority: Critical
> Attachments:
> AlternativesforMakingShuffleMapTasksRobusttoMultipleAttempts.pdf
>
>
> When stages get retried, a task may have more than one attempt running at the
> same time, on the same executor. Currently this causes problems for
> ShuffleMapTasks, since all attempts try to write to the same output files.
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