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Posted to mapreduce-issues@hadoop.apache.org by "Bochun Bai (JIRA)" <ji...@apache.org> on 2011/08/03 03:50:27 UTC

[jira] [Commented] (MAPREDUCE-2734) DistCp with FairScheduler assign all map tasks in one TT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078554#comment-13078554 ] 

Bochun Bai commented on MAPREDUCE-2734:
---------------------------------------

Turning mapred.fairscheduler.assignmultiple=false solves the problem.
There is no component like contrib/fair-scheduler. I move this issues to the jobtracker.

Considering two possible improvement: 
1. document this parameter in mapreduce/src/docs/src/documentation/content/xdocs/fair_scheduler.xml
2. change the default value to false.


> DistCp with FairScheduler assign all map tasks in one TT
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-2734
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2734
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker
>    Affects Versions: 0.21.0
>            Reporter: Bochun Bai
>            Assignee: Bochun Bai
>            Priority: Trivial
>
> 1 Using FairScheduler.
> 2 distcp a directory contains 5 files.
> The DistCp job will launch 5 map tasks, and FairScheduler assign them to one TaskTracker.
> It should be assigned different, like the original JobQueueScheduler.

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