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https://issues.apache.org/jira/browse/MAPREDUCE-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Chen updated MAPREDUCE-1463:
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Attachment: MAPREDUCE-1463-v1.patch
Our proposal is starting the reducers for job with few mappers or reducers.
We make these two number configurable.
I have uploaded the patch according to this proposal.
Unit test will be included later.
> Reducer should start faster for smaller jobs
> --------------------------------------------
>
> Key: MAPREDUCE-1463
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1463
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/fair-share
> Reporter: Scott Chen
> Assignee: Scott Chen
> Attachments: MAPREDUCE-1463-v1.patch
>
>
> Our users often complain about the slowness of smaller ad-hoc jobs.
> The overhead to wait for the reducers to start in this case is significant.
> It will be good if we can start the reducer sooner in this case.
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