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https://issues.apache.org/jira/browse/YARN-6775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088169#comment-16088169
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Wangda Tan commented on YARN-6775:
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[~nroberts], there're some conflicts to apply patches to branch-2 (maybe 2.8 as
well), do you mind to take a look?
> 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, YARN-6775.branch-2.8.002.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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