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Posted to mapreduce-issues@hadoop.apache.org by "Mostafa Elhemali (JIRA)" <ji...@apache.org> on 2012/12/02 23:45:58 UTC

[jira] [Commented] (MAPREDUCE-2393) No total min share limitation of all pools

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508389#comment-13508389 ] 

Mostafa Elhemali commented on MAPREDUCE-2393:
---------------------------------------------

Can you please add a test for this case?
                
> No total min share limitation of all pools
> ------------------------------------------
>
>                 Key: MAPREDUCE-2393
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2393
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/fair-share
>    Affects Versions: 0.21.0
>            Reporter: Denny Ye
>              Labels: fair, scheduler
>         Attachments: MAPREDUCE-2393.patch
>
>
> hi, there is no limitation about min share of all pools with cluster total shares. User can define arbitrary amount of min share for each pool. It has such description in <fair scheduler design document>, but no regular code. 
> It may critical for slot distribution. One pool can hold all cluster slots to meet it's min share that greater than cluster total slots very much.
> If that case has happened, we should scaled down proportionally.

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