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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2210) Preemption does not obey job priority
Date Tue, 07 Dec 2010 19:28:10 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968902#action_12968902

Scott Chen commented on MAPREDUCE-2210:

Hi Adam,
Actually preemption does kill based on FairShare and minimal slots requirement. It doesn't
kill tasks beyond your FairShare.
We can discuss this more.

> Preemption does not obey job priority
> -------------------------------------
>                 Key: MAPREDUCE-2210
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2210
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/fair-share
>            Reporter: Adam Kramer
> Preemption, as it currently works, kills running tasks that are "unfair" in terms of
the amount of task attention used by one job compared to another.
> The bug is that pre-emption occurs such that HIGH priority jobs have their tasks killed
when the cluster is filled with lower-priority jobs. Pre-emption should only be allowed to
kill tasks for jobs with equal or lower priority.

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