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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4502) Node-level aggregation with combining the result of maps
Date Tue, 30 Apr 2013 07:54:19 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645366#comment-13645366
] 

Hadoop QA commented on MAPREDUCE-4502:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12581124/MAPREDUCE-4502.8.patch
  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 10 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:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient:

                  org.apache.hadoop.mapreduce.lib.input.TestDelegatingInputFormat
                  org.apache.hadoop.mapreduce.lib.input.TestCombineFileInputFormat
                  org.apache.hadoop.mapred.lib.TestDelegatingInputFormat
                  org.apache.hadoop.mapred.TestFileInputFormat

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3559//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3559//console

This message is automatically generated.
                
> Node-level aggregation with combining the result of maps
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-4502
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4502
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: applicationmaster, mrv2
>    Affects Versions: 3.0.0
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: design_v2.pdf, design_v3.pdf, MAPREDUCE-4502.1.patch, MAPREDUCE-4502.2.patch,
MAPREDUCE-4502.3.patch, MAPREDUCE-4502.4.patch, MAPREDUCE-4502.5.patch, MAPREDUCE-4502.6.patch,
MAPREDUCE-4502.7.patch, MAPREDUCE-4502.8.patch, MAPREDUCE-4502.8.patch, MAPREDUCE-4525-pof.diff,
speculative_draft.pdf
>
>
> The shuffle costs is expensive in Hadoop in spite of the existence of combiner, because
the scope of combining is limited within only one MapTask. To solve this problem, it's a good
way to aggregate the result of maps per node/rack by launch combiner.
> This JIRA is to implement the multi-level aggregation infrastructure, including combining
per container(MAPREDUCE-3902 is related), coordinating containers by application master without
breaking fault tolerance of jobs.

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