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https://issues.apache.org/jira/browse/MAPREDUCE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15176874#comment-15176874
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Andrew Wang commented on MAPREDUCE-2632:
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[~kasha] mind adding some release notes for this change? Doing some
3.0.0-related cleanup.
> Avoid calling the partitioner when the numReduceTasks is 1.
> -----------------------------------------------------------
>
> Key: MAPREDUCE-2632
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2632
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 0.23.0
> Reporter: Ravi Teja Ch N V
> Assignee: Sunil G
> Fix For: 3.0.0
>
> Attachments: 0001-MAPREDUCE-2632.patch, MAPREDUCE-2632-1.patch,
> MAPREDUCE-2632.patch, mr-2632-2.patch, mr-2632-3.patch, mr-2632-4.patch
>
>
> We can avoid the call to the partitioner when the number of reducers is
> 1.This will avoid the unnecessary computations by the partitioner.
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