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https://issues.apache.org/jira/browse/HADOOP-939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting resolved HADOOP-939.
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Resolution: Duplicate
Sorting can be disabled by setting the number of reduce tasks to zero, so that
map outputs are written directly. Reduce makes no sense without sorting.
> 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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