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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2632) Avoid calling the partitioner when the numReduceTasks is 1.
Date Sat, 09 May 2015 12:02:21 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14536448#comment-14536448
] 

Hudson commented on MAPREDUCE-2632:
-----------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #922 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/922/])
MAPREDUCE-2632. Avoid calling the partitioner when the numReduceTasks is 1. (Ravi Teja Ch
N V and Sunil G via kasha) (kasha: rev bdbd10fde1539920de937404a785e6ed34dd5628)
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/output/MapFileOutputFormat.java
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/Partitioner.java
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/lib/output/TestMapFileOutputFormat.java
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestMapFileOutputFormat.java
* hadoop-mapreduce-project/CHANGES.txt
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapFileOutputFormat.java
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/Partitioner.java


> 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
>
>         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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