[jira] [Commented] (YARN-6361) FairScheduler: FSLeafQueue.fetchAppsWithDemand CPU usage is high with big queues

["YunFan Zhou (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16114061#comment-16114061 ] 

YunFan Zhou commented on YARN-6361:
-----------------------------------

[~yufeigu] Hi, Yufei. I would like to work on this JIRA if you have not yet started working, please inform can I take over this JIRA. Thank you.

> FairScheduler: FSLeafQueue.fetchAppsWithDemand CPU usage is high with big queues
> --------------------------------------------------------------------------------
>
>                 Key: YARN-6361
>                 URL: https://issues.apache.org/jira/browse/YARN-6361
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Miklos Szegedi
>            Assignee: Yufei Gu
>            Priority: Minor
>         Attachments: dispatcherthread.png, threads.png
>
>
> FSLeafQueue.fetchAppsWithDemand sorts the applications by the current policy. Most of the time is spent in FairShareComparator.compare. We could improve this by doing the calculations outside the sort loop {{(O\(n\))}} and we sorted by a fixed number inside instead {{O(n*log\(n\))}}. This could be an performance issue when there are huge number of applications in a single queue. The attachments shows the performance impact when there are 10k applications in one queue.



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