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https://issues.apache.org/jira/browse/MAPREDUCE-4502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsuyoshi OZAWA updated MAPREDUCE-4502:
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Attachment: design_v2.pdf
I redesigned its architecture with the ideas inspired by discussion among
Chris and Karthik. Main diffs are as follows:
1. All aggregations are preformed in containers(at the end of MapTasks).
Because of this change, the umbilical protocol is need to change.
3. No task types are added newly.
4. Rack-aware aggregation is taken into account.
Any feedback are welcome.
Thanks,
- Tsuyoshi
> 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
> Reporter: Tsuyoshi OZAWA
> Assignee: Tsuyoshi OZAWA
> Attachments: design_v2.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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