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