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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2498) Respect labels in preemption policy of capacity scheduler
Date Wed, 15 Apr 2015 23:12:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-2498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14497261#comment-14497261
] 

Wangda Tan commented on YARN-2498:
----------------------------------

Discussed with [~mayank_bansal], taking over and working on this, will post patch/implementation-notes
soon.

> 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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