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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941759#comment-15941759
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Eric Payne commented on YARN-2113:
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bq. as of now, YARN doesn't calculate UL for different priorities, but that
doesn't mean we should allow lower priority app to preempt higher priority app.
[~leftnoteasy], it boils down to what is more important: user guarantees or
priority guarantees. For us, the user limit guarantee is more important. When
assigning new containers, YARN will assign them to the under-served user's app,
even if the over-served user has a higher priority app. I think preemption
should have the same hierarchy.
> 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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