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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4399) Fix performance regression in shuffle
Date Fri, 20 Jul 2012 19:13:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419454#comment-13419454
] 

Luke Lu commented on MAPREDUCE-4399:
------------------------------------

@Suresh, 0.20.2 use jetty 6.1.14, which doesn't have this particular issue. This is a workaround
specifically for jetty 6.1.26 and harmless for other versions.
                
> Fix performance regression in shuffle 
> --------------------------------------
>
>                 Key: MAPREDUCE-4399
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4399
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: performance, tasktracker
>    Affects Versions: 0.20.203.0, 1.0.3
>            Reporter: Luke Lu
>            Assignee: Luke Lu
>         Attachments: mapreduce-4399-branch-1.patch
>
>
> There is a significant (up to 3x) performance regression in shuffle (vs 0.20.2) in the
Hadoop 1.x series. Most noticeable with high-end switches.

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