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