[jira] [Created] (YARN-6775) CapacityScheduler: Improvements to assignContainers()

["Nathan Roberts (JIRA)" <ji...@apache.org>]

Nathan Roberts created YARN-6775:
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             Summary: 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: 3.0.0-alpha3, 2.8.1
            Reporter: Nathan Roberts
            Assignee: Nathan Roberts


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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