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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4502) Multi-level aggregation with combining the result of maps per node/rack
Date Wed, 17 Apr 2013 11:23:19 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633962#comment-13633962
] 

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/12579117/design_v3.pdf
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3533//console

This message is automatically generated.
                
> Multi-level aggregation with combining the result of maps per node/rack
> -----------------------------------------------------------------------
>
>                 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-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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