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https://issues.apache.org/jira/browse/HADOOP-939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517690
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Arun C Murthy commented on HADOOP-939:
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@Joydeep
You can control key-partions using a custom partitioner:
http://lucene.apache.org/hadoop/api/org/apache/hadoop/mapred/Partitioner.html
Does that help?
> No-sort optimization
> --------------------
>
> Key: HADOOP-939
> URL: https://issues.apache.org/jira/browse/HADOOP-939
> Project: Hadoop
> Issue Type: New Feature
> Components: mapred
> Environment: all
> Reporter: Doug Judd
>
> There should be a way to tell the mapred framework that the output of the
> map() phase will already be sorted. The Reduce phase can just merge the
> intermediate files together without sorting.
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