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Posted to mapreduce-issues@hadoop.apache.org by "Harsh J (JIRA)" <ji...@apache.org> on 2011/06/30 07:44:28 UTC

[jira] [Updated] (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:all-tabpanel ]

Harsh J updated MAPREDUCE-2632:
-------------------------------

    Hadoop Flags: [Incompatible change]

This would be an incompatible change since API users may always expect a partitioner logic to get called despite reducer # settings, and the change may not even initialize it.

> 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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