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Posted to mapreduce-issues@hadoop.apache.org by "Harsh J (JIRA)" <ji...@apache.org> on 2011/06/30 07:36:28 UTC

[jira] [Commented] (MAPREDUCE-2632) Avoid calling the partitioner when the numReduceTasks is 1.

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057626#comment-13057626 ] 

Harsh J commented on MAPREDUCE-2632:
------------------------------------

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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