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From "Xianyin Xin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3885) ProportionalCapacityPreemptionPolicy doesn't preempt if queue is more than 2 level
Date Wed, 15 Jul 2015 01:55:06 GMT

    [ https://issues.apache.org/jira/browse/YARN-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14627404#comment-14627404
] 

Xianyin Xin commented on YARN-3885:
-----------------------------------

Agree [~leftnoteasy]. suppose we have a case

   parent_of_A
    /               \
  A                A's brother B

and A has 9 extra and 10 preemptable, but B has 9 extra and 0 preemptable (we can set the
queue unpreemptable), then parent_of_A has 18 extra, but how many preemptable it should offer?
It should be 9. so we'd better limit preemptable to be less than extra for queues at any level.

Please correct me if i'm wrong.

> ProportionalCapacityPreemptionPolicy doesn't preempt if queue is more than 2 level
> ----------------------------------------------------------------------------------
>
>                 Key: YARN-3885
>                 URL: https://issues.apache.org/jira/browse/YARN-3885
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>    Affects Versions: 2.8.0
>            Reporter: Ajith S
>            Assignee: Ajith S
>            Priority: Blocker
>         Attachments: YARN-3885.02.patch, YARN-3885.03.patch, YARN-3885.04.patch, YARN-3885.patch
>
>
> when preemption policy is {{ProportionalCapacityPreemptionPolicy.cloneQueues}}
> this piece of code, to calculate {{untoucable}} doesnt consider al the children, it considers
only immediate childern



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