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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5462) In map-side sort, swap entire meta entries instead of indexes for better cache performance
Date Fri, 16 Aug 2013 08:30:49 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13742029#comment-13742029
] 

Sandy Ryza commented on MAPREDUCE-5462:
---------------------------------------

Also, I just applied this on a 6 node cluster.  Total time on a wordcount job with 540 map
tasks went down from 7 minutes 45 seconds to 6 minutes 15 seconds.
                
> In map-side sort, swap entire meta entries instead of indexes for better cache performance

> -------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5462
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5462
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: performance, task
>    Affects Versions: 2.1.0-beta
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>             Fix For: 2.1.1-beta
>
>         Attachments: MAPREDUCE-5462.patch
>
>


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