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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5352) Optimize node local splits generated by CombineFileInputFormat
Date Sat, 29 Jun 2013 01:01:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13695988#comment-13695988
] 

Hadoop QA commented on MAPREDUCE-5352:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12590118/MAPREDUCE-5352.2.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3813//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3813//console

This message is automatically generated.
                
> 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
>         Attachments: MAPREDUCE-5352.1.txt, MAPREDUCE-5352.2.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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