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https://issues.apache.org/jira/browse/MAPREDUCE-4399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Lu updated MAPREDUCE-4399:
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Attachment: mapreduce-4399-branch-1.patch
The crux of the problem is jetty 6.1.26's internal buffer management with
transfer-encoding = trunked. The issue was also independently discovered and
analyzed elsewhere: http://goo.gl/dtM4D
The patch is trivial.
> 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: 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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