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https://issues.apache.org/jira/browse/MAPREDUCE-4502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13583003#comment-13583003
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Hadoop QA commented on MAPREDUCE-4502:
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{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12570272/MAPREDUCE-4502.3.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 9 new
or modified test files.
{color:red}-1 one of tests included doesn't have a timeout.{color}
{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:red}-1 findbugs{color}. The patch appears to introduce 1 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-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.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3349//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3349//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-core.html
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3349//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, MAPREDUCE-4502.1.patch,
> MAPREDUCE-4502.2.patch, MAPREDUCE-4502.3.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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