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https://issues.apache.org/jira/browse/MAPREDUCE-4502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13585630#comment-13585630
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Tsuyoshi OZAWA commented on MAPREDUCE-4502:
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Thanks Tsz,
Surenkumar said that this is HADOOP-9112 related problem. I'll attach the same
file and check whether it works well.
> 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-4502.4.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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