[jira] [Commented] (YARN-2498) Respect labels in preemption policy of capacity scheduler

["Eric Payne (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-2498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355361#comment-14355361 ] 

Eric Payne commented on YARN-2498:
----------------------------------

Hi [~leftnoteasy]. Great job on this patch. I have one minor nit:

Would you mind changing {{duductAvailableResourceAccordingToLabel}} to {{deductAvailableResourceAccordingToLabel}}? That is, {{duduct...}} should be {{deduct...}}.

> Respect labels in preemption policy of capacity scheduler
> ---------------------------------------------------------
>
>                 Key: YARN-2498
>                 URL: https://issues.apache.org/jira/browse/YARN-2498
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2498.patch, YARN-2498.patch, YARN-2498.patch, yarn-2498-implementation-notes.pdf
>
>
> There're 3 stages in ProportionalCapacityPreemptionPolicy,
> # Recursively calculate {{ideal_assigned}} for queue. This is depends on available resource, resource used/pending in each queue and guaranteed capacity of each queue.
> # Mark to-be preempted containers: For each over-satisfied queue, it will mark some containers will be preempted.
> # Notify scheduler about to-be preempted container.
> We need respect labels in the cluster for both #1 and #2:
> For #1, when there're some resource available in the cluster, we shouldn't assign it to a queue (by increasing {{ideal_assigned}}) if the queue cannot access such labels
> For #2, when we make decision about whether we need preempt a container, we need make sure, resource this container is *possibly* usable by a queue which is under-satisfied and has pending resource.



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