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https://issues.apache.org/jira/browse/MAPREDUCE-5352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741349#comment-13741349
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Hudson commented on MAPREDUCE-5352:
-----------------------------------
SUCCESS: Integrated in Hadoop-trunk-Commit #4271 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/4271/])
Update CHANGES.txt to move YARN-1045 and MAPREDUCE-5352 to the correct version.
(sseth: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1514432)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-yarn-project/CHANGES.txt
> 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: 2.1.0-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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