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https://issues.apache.org/jira/browse/SPARK-1239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163423#comment-14163423
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DB Tsai commented on SPARK-1239:
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+1, we run into this issue as well.
> Don't fetch all map output statuses at each reducer during shuffles
> -------------------------------------------------------------------
>
> Key: SPARK-1239
> URL: https://issues.apache.org/jira/browse/SPARK-1239
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, Spark Core
> Affects Versions: 1.0.2, 1.1.0
> Reporter: Patrick Wendell
> Assignee: Kostas Sakellis
>
> Instead we should modify the way we fetch map output statuses to take both a
> mapper and a reducer - or we should just piggyback the statuses on each task.
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