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From "Naganarasimha G R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6681) Eliminate double-copy of child queues in canAssignToThisQueue
Date Sat, 01 Jul 2017 06:52:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071051#comment-16071051

Naganarasimha G R commented on YARN-6681:

[~daryn], Instead of the deadlock i will try to handle the optimization in the YARN-6741 and
will commit this patch so that we can move ahead with this optimization.

> Eliminate double-copy of child queues in canAssignToThisQueue
> -------------------------------------------------------------
>                 Key: YARN-6681
>                 URL: https://issues.apache.org/jira/browse/YARN-6681
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: YARN-6681.2.branch-2.8.patch, YARN-6681.2.branch-2.patch, YARN-6681.2.trunk.patch,
YARN-6681.branch-2.8.patch, YARN-6681.branch-2.patch, YARN-6681.trunk.patch
> 20% of the time in {{AbstractCSQueue#canAssignToThisQueue}} is spent performing two duplications
a treemap of child queues into a list - once to test for null, second to see if it's empty.
 Eliminating the dups reduces the overhead to 2%.

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