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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2632) Avoid calling the partitioner when the numReduceTasks is 1.
Date Fri, 13 May 2016 05:06:12 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Wang updated MAPREDUCE-2632:
-----------------------------------
    Target Version/s:   (was: )
        Release Note: A partitioner is now only created if there are multiple reducers.

I added a release note based on my understanding of this patch, please update if something's
off.

> 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-alpha1
>
>         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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