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https://issues.apache.org/jira/browse/MAPREDUCE-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192560#comment-13192560
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Hudson commented on MAPREDUCE-3710:
-----------------------------------
Integrated in Hadoop-Common-0.23-Commit #413 (See
[https://builds.apache.org/job/Hadoop-Common-0.23-Commit/413/])
MAPREDUCE-3710. Improved FileInputFormat to return better locality for the
last split. Contributed by Siddarth Seth.
svn merge --ignore-ancestry -c 1235510 ../../trunk/
vinodkv :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1235511
Files :
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/FileInputFormat.java
*
/hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/FileInputFormat.java
*
/hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestFileInputFormat.java
*
/hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/lib/input/TestFileInputFormat.java
> last split generated by FileInputFormat.getSplits may not have the best
> locality
> --------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3710
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3710
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1, mrv2
> Affects Versions: 0.23.0, 1.0.0
> Reporter: Siddharth Seth
> Assignee: Siddharth Seth
> Fix For: 0.23.1
>
> Attachments: MR-3710_v1.txt
>
>
> The last split generated by FileInputFormat.getSplits considers
> {{blkLocations.length-1}} to be the hosts for the split.
> The last split may be larger than the rest (SPLIT_SLOP=1.1 by default) - in
> which case locality is picked up from a smaller block.
> e.g. 1027MB file with a 128MB split size. The last split ends up being 131MB.
> The hosts for locality end up being the nodes containing the 3MB block
> instead of the 128MB block.
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