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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-6775) CapacityScheduler: Improvements to assignContainers, avoid unnecessary canAssignToUser/Queue calls
Date Thu, 13 Jul 2017 17:32:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-6775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wangda Tan updated YARN-6775:
-----------------------------
    Fix Version/s: 3.0.0-beta1

> CapacityScheduler: Improvements to assignContainers, avoid unnecessary canAssignToUser/Queue
calls
> --------------------------------------------------------------------------------------------------
>
>                 Key: YARN-6775
>                 URL: https://issues.apache.org/jira/browse/YARN-6775
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>    Affects Versions: 2.8.1, 3.0.0-alpha3
>            Reporter: Nathan Roberts
>            Assignee: Nathan Roberts
>             Fix For: 3.0.0-beta1
>
>         Attachments: YARN-6775.001.patch, YARN-6775.002.patch, YARN-6775.branch-2.002.patch
>
>
> There are several things in assignContainers() that are done multiple times even though
the result cannot change (canAssignToUser, canAssignToQueue). Add some local caching to take
advantage of this fact.
> Will post patch shortly. Patch includes a simple throughput test that demonstrates when
we have users at their user-limit, the number of NodeUpdateSchedulerEvents we can process
can be improved from 13K/sec to 50K/sec.



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