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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5701) With fair scheduler, long running jobs can easily occurpy a lot of task slots
Date Thu, 23 Apr 2009 20:11:30 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702084#action_12702084
] 

Hong Tang commented on HADOOP-5701:
-----------------------------------

In other words, fair share scheduler cannot really allocate fair shares without preemption.


> With fair scheduler, long running jobs can easily occurpy a lot of task slots
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-5701
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5701
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/fair-share
>            Reporter: Tsz Wo (Nicholas), SZE
>
> Current fair scheduler implementation favor long running jobs since once a task slot
is assigned to a job, the fair scheduler is not able to reclaim it.

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