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From "YunFan Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6361) FairScheduler: FSLeafQueue.fetchAppsWithDemand CPU usage is high with big queues
Date Sat, 05 Aug 2017 01:49:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16115205#comment-16115205

YunFan Zhou commented on YARN-6361:

[~yufeigu] Thank Yufei.
Sorry, I'm off the subject. But either way, the efficiency of raising the *fetchAppsWithDemand
*is something that must be done. I have thought about the optimal method for two days and
tested my thoughts today.
*Thank you very much for your confidence in me.*

> 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: YunFan Zhou
>            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

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