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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1463) Reducer should start faster for smaller jobs
Date Fri, 05 Feb 2010 23:50:28 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830379#action_12830379
] 

Todd Lipcon commented on MAPREDUCE-1463:
----------------------------------------

Why not integrate this directly into JobInProgress.scheduleReduces() rather than in the fairscheduler?
This should be a generally useful feature.

> 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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