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https://issues.apache.org/jira/browse/SPARK-4584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14225563#comment-14225563
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Nishkam Ravi commented on SPARK-4584:
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[~andrewor14] Just curious, why is that relevant here?
> 2x Performance regression for Spark-on-YARN
> -------------------------------------------
>
> Key: SPARK-4584
> URL: https://issues.apache.org/jira/browse/SPARK-4584
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 1.2.0
> Reporter: Nishkam Ravi
> Assignee: Sandy Ryza
> Priority: Blocker
>
> Significant performance regression observed for Spark-on-YARN (upto 2x) after
> 1.2 rebase. The offending commit is: 70e824f750aa8ed446eec104ba158b0503ba58a9
> from Oct 7th. Problem can be reproduced with JavaWordCount against a large
> enough input dataset in YARN cluster mode.
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