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Posted to yarn-issues@hadoop.apache.org by "Wangda Tan (JIRA)" <ji...@apache.org> on 2017/07/13 17:30:00 UTC
[jira] [Updated] (YARN-6775) CapacityScheduler: Improvements to
assignContainers, avoid unnecessary canAssignToUser/Queue calls
[ https://issues.apache.org/jira/browse/YARN-6775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wangda Tan updated YARN-6775:
-----------------------------
Summary: CapacityScheduler: Improvements to assignContainers, avoid unnecessary canAssignToUser/Queue calls (was: CapacityScheduler: Improvements to assignContainers())
> 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
> 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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