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From "Nathan Roberts (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6775) CapacityScheduler: Improvements to assignContainers()
Date Thu, 13 Jul 2017 13:45:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085715#comment-16085715
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Nathan Roberts commented on YARN-6775:
--------------------------------------

Thanks [~leftnoteasy]. I looked at UT failures. I've seen these being flaky in the past. All
pass locally except TestRMRestart which is a known problem: YARN-6759

I'll put up a branch-2 and 2.8 patch today.

> CapacityScheduler: Improvements to assignContainers()
> -----------------------------------------------------
>
>                 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
>         Attachments: YARN-6775.001.patch, YARN-6775.002.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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