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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023111#comment-16023111
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Eric Payne commented on YARN-2113:
----------------------------------
bq. I might need to backport YARN-5889 first and then this ticket. Thoughts?
Yes, YARN-2113 is coupled with YARN-5889, so YARN-5889 should also be
backported to branch-2.
However, it gets complicated if we were to try to backport YARN-5889 to
branch-2.8. I tried to do that, but I ran into some deadlocks in the unit
tests. I believe that YARN-5889 will have other dependencies such as YARN-3091,
YARN-3140, etc.
Rather than backporting YARN-5889 and all of its prereqs to 2.8, an alternative
would be to separate out from YARN-5889 only the parts needed to support
YARN-2113. I think the meat of it is in:
{code:title=LeafQueue#computeUserLimit}
int usersCount = getNumActiveUsers();
Resource resourceUsed = totalResUsageForActiveUsers.getUsed(nodePartition);
// For non-activeUser calculation, consider all users count.
if (!activeUser) {
resourceUsed = currentCapacity;
usersCount = users.size();
}
{code}
> 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: capacity scheduler
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Sunil G
> Fix For: 3.0.0-alpha3
>
> 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-2113.0014.patch, YARN-2113.0015.patch,
> YARN-2113.0016.patch, YARN-2113.0017.patch, YARN-2113.0018.patch,
> YARN-2113.0019.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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