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