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https://issues.apache.org/jira/browse/MAPREDUCE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057626#comment-13057626
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Harsh J commented on MAPREDUCE-2632:
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This went in as an Incompatible Change in 0.21.0. Has it been reverted away to
demand a re-entry?
MAPREDUCE-1287 did the change earlier I think.
> 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
> Components: tasktracker
> Affects Versions: 0.23.0
> Reporter: Ravi Teja Ch N V
>
> 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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