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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2441) regression: maximum limit of -1 + user-lmit math appears to be off
Date Wed, 11 May 2011 23:27:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032173#comment-13032173
] 

Allen Wittenauer commented on MAPREDUCE-2441:
---------------------------------------------

Actually, let me correct myself.  Task stealing does work--but in a sort of weird and unpredictable
way.  Basically, an individual user is limited to the "natural" size of the queue they submitted.
So if two users are in the same queue that queue can steal up to 2xqueue size, etc.

> regression: maximum limit of -1 + user-lmit math appears to be off
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2441
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2441
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 0.20.203.0
>            Reporter: Allen Wittenauer
>            Priority: Critical
>         Attachments: capsched.xml
>
>
> The math around the slot usage when maximum-capacity=-1 appears to be faulty.  See comments.

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