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From "Nishkam Ravi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-4584) 2x Performance regression for Spark-on-YARN
Date Wed, 26 Nov 2014 00:29:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-4584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14225479#comment-14225479
] 

Nishkam Ravi commented on SPARK-4584:
-------------------------------------

Use of SecurityManager may be suppressing a JIT compiler optimization.

> 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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