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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sunil G updated YARN-2113:
--------------------------
Attachment: YARN-2113 Intra-QueuePreemption Behavior.pdf
Attaching a doc which captures various preemption order policies and its
behavior.
[~eepayne]
As per this
[comment|https://issues.apache.org/jira/browse/YARN-2113?focusedCommentId=15985032&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15985032],
I assumed that preemption has to occur based on priority even when
USERLIMIT_FIRST is configured. Yes, preemption will happen for users who are
above its UL. But given example in tat comment was pointing a case where user's
used were under UL and preemption was needed or not.
Hence I added the check which you have mentioned in above comment to have
priority preemption even if user.used is lesser than UL and USERLIMIT_FIRST is
configured. Now as per the attached doc, we are clear that what should be the
behavior for each mode. So I will be removing that check in next patch which is
not needed.
> 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: IntraQueue Preemption-Impact Analysis.pdf,
> TestNoIntraQueuePreemptionIfBelowUserLimitAndDifferentPrioritiesWithExtraUsers.txt,
> YARN-2113.0001.patch, YARN-2113.0002.patch, YARN-2113.0003.patch,
> YARN-2113.0004.patch, YARN-2113.0005.patch, YARN-2113.0006.patch,
> YARN-2113.0007.patch, YARN-2113.0008.patch, YARN-2113.0009.patch,
> YARN-2113.0010.patch, YARN-2113.0011.patch, YARN-2113.0012.patch,
> YARN-2113.0013.patch, YARN-2113.apply.onto.0012.ericp.patch, YARN-2113
> Intra-QueuePreemption Behavior.pdf, 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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