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https://issues.apache.org/jira/browse/SPARK-4584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-4584.
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Resolution: Fixed
> 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: Marcelo Vanzin
> 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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