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https://issues.apache.org/jira/browse/MAPREDUCE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100119#comment-13100119
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Hadoop QA commented on MAPREDUCE-2632:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  
http://issues.apache.org/jira/secure/attachment/12493554/MAPREDUCE-2632-1.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

    -1 findbugs.  The patch appears to introduce 14 new Findbugs (version 
1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

    -1 core tests.  The patch failed these unit tests:

                  org.apache.hadoop.yarn.server.nodemanager.TestNMAuditLogger

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//testReport/
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-hs.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-shuffle.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-common.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-app.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-jobclient.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-core.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-common.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-resourcemanager.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-nodemanager.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-yarn-common.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-yarn-api.html
Console output: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/637//console

This message is automatically generated.

> 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
>         Attachments: MAPREDUCE-2632-1.patch, MAPREDUCE-2632.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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