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https://issues.apache.org/jira/browse/YARN-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477484#comment-15477484
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Sunil G commented on YARN-4945:
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HI [~leftnoteasy]
Thanks for comments..
I generally understood the overall picture. However one doubt to start with
{{Q.unallocated = Q.used - Q.selected;}}
Here *selected* means guaranteed?
bq.In each leaf queue, according to intra-queue preemption quota and other
queue status, such as queue-policy, decide ideal-allocation and how much to
preempt for each app
It makes sense in other policies. For priority, only if demand is there from
high priority apps, we can take resource from lower priority apps. So while
doing computing ideal allocation, we can consider full resources from an app as
preemptable. This decision can be taken in preemptionPolicy. Does this sounds
correct with your thoughts?
> [Umbrella] Capacity Scheduler Preemption Within a queue
> -------------------------------------------------------
>
> Key: YARN-4945
> URL: https://issues.apache.org/jira/browse/YARN-4945
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Wangda Tan
> Attachments: Intra-Queue Preemption Use Cases.pdf,
> IntraQueuepreemption-CapacityScheduler (Design).pdf, YARN-2009-wip.2.patch,
> YARN-2009-wip.patch, YARN-2009-wip.v3.patch, YARN-2009.v0.patch
>
>
> This is umbrella ticket to track efforts of preemption within a queue to
> support features like:
> YARN-2009. YARN-2113. YARN-4781.
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