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https://issues.apache.org/jira/browse/MAPREDUCE-4399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406967#comment-13406967
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Luke Lu commented on MAPREDUCE-4399:
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Thanks to John Poelman and Shreyas Subramanya of IBM BigInsights performance QA
for noticing the issue and verifying my fix.
> 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
>
> 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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