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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-6681) Eliminate double-copy of child queues in canAssignToThisQueue
Date Mon, 05 Jun 2017 14:45:04 GMT

     [ https://issues.apache.org/jira/browse/YARN-6681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daryn Sharp updated YARN-6681:
------------------------------
    Attachment: YARN-6681.2.trunk.patch
                YARN-6681.2.branch-2.patch
                YARN-6681.2.branch-2.8.patch

Updated {{ParentQueue#hasChildQueues}} to return true as to avoid unnecessary synchronization
or locks.

> 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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