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https://issues.apache.org/jira/browse/HADOOP-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601930#action_12601930
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Hudson commented on HADOOP-3443:
--------------------------------
Integrated in Hadoop-trunk #511 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/511/])
> map outputs should not be renamed between partitions
> ----------------------------------------------------
>
> Key: HADOOP-3443
> URL: https://issues.apache.org/jira/browse/HADOOP-3443
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.17.0
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Priority: Critical
> Fix For: 0.18.0
>
> Attachments: hadoop-3443-1.patch, hadoop-3443-1v17.patch
>
>
> If a map finishes with out having to spill its data buffer, the map outputs
> are sorted and written to disk. However, no care is taken to make sure that
> the same partition is used to write it out before it is renamed. On nodes
> with multiple disks assigned to the task trackers, this will likely cause an
> addition read/write cycle to disk that is very expensive.
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