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https://issues.apache.org/jira/browse/MAPREDUCE-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835076#action_12835076
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Arun C Murthy commented on MAPREDUCE-1463:
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Actually, assuming we have a reasonable model, I'd do it on the JobTracker,
maybe in JobInProgress.initTasks i.e. during job-initialization.
> 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: jobtracker
> Reporter: Scott Chen
> Assignee: Scott Chen
> Attachments: MAPREDUCE-1463-v1.patch, MAPREDUCE-1463-v2.patch,
> MAPREDUCE-1463-v3.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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