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Date: Thu, 1 Aug 2013 17:57:49 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-5352) Optimize node local splits
 generated by CombineFileInputFormat
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-5352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726672#comment-13726672 ] 

Hudson commented on MAPREDUCE-5352:
-----------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #4198 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/4198/])
MAPREDUCE-5352. Optimize node local splits generated by CombineFileInputFormat. (sseth) (sseth: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1509345)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/CombineFileInputFormat.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/lib/input/TestCombineFileInputFormat.java

                
> Optimize node local splits generated by CombineFileInputFormat 
> ---------------------------------------------------------------
>
>                 Key: MAPREDUCE-5352
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5352
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 2.0.5-alpha
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>             Fix For: 2.1.1-beta
>
>         Attachments: MAPREDUCE-5352.1.txt, MAPREDUCE-5352.2.txt, MAPREDUCE-5352.3.txt, MAPREDUCE-5352.4.branch-2.1-beta.txt, MAPREDUCE-5352.4.txt
>
>
> CombineFileInputFormat currently walks through all available nodes and generates multiple (maxSplitsPerNode) splits on a single node before attempting to generate splits on subsequent nodes. This ends up reducing the possibility of generating splits for subsequent nodes - since these blocks will no longer be available for subsequent nodes. Allowing splits to go 1 block above the max-split-size makes this worse.
> Allocating a single split per node in one iteration, should help increase the distribution of splits across nodes - so the subsequent nodes will have more blocks to choose from.

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