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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15944117#comment-15944117
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Jason Lowe commented on YARN-2113:
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I agree with Eric here. I see priority as a way for a user to change the order
applications are considered for assigning free resources, but the priority is
moot if the user is above their limit in the queue. In practice user limit
essentially trumps app priority, so I believe the preemption policy should
behave similarly. Otherwise users can abuse their limits and perform a form of
DoS attack on other users by artificially inflating their app priorities.
> Add cross-user preemption within CapacityScheduler's leaf-queue
> ---------------------------------------------------------------
>
> Key: YARN-2113
> URL: https://issues.apache.org/jira/browse/YARN-2113
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: scheduler
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Sunil G
> Attachments: YARN-2113.0001.patch, YARN-2113.0002.patch,
> YARN-2113.0003.patch, YARN-2113.v0.patch
>
>
> Preemption today only works across queues and moves around resources across
> queues per demand and usage. We should also have user-level preemption within
> a queue, to balance capacity across users in a predictable manner.
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