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https://issues.apache.org/jira/browse/MAPREDUCE-4502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524738#comment-14524738
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Hadoop QA commented on MAPREDUCE-4502:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | patch | 0m 1s | The patch command could not apply
the patch during dryrun. |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12592783/MAPREDUCE-4502.10.patch
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| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f1a152c |
| Console output |
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5534/console |
This message was 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: MAPREDUCE-4502.1.patch, MAPREDUCE-4502.10.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-4502.9.patch,
> MAPREDUCE-4502.9.patch, MAPREDUCE-4525-pof.diff, design_v2.pdf,
> design_v3.pdf, 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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