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From "Yufei Gu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-6307) Refactor FairShareComparator#compare
Date Mon, 24 Jul 2017 21:41:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-6307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yufei Gu updated YARN-6307:
---------------------------
    Attachment: YARN-6307.003.patch

> Refactor FairShareComparator#compare
> ------------------------------------
>
>                 Key: YARN-6307
>                 URL: https://issues.apache.org/jira/browse/YARN-6307
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>            Reporter: Yufei Gu
>            Assignee: Yufei Gu
>         Attachments: YARN-6307.001.patch, YARN-6307.002.patch, YARN-6307.003.patch
>
>
> The method does three things: compare the min share usage, compare fair share usage by
checking weight ratio, break tied by submit time and name. They are mixed with each other
which is not easy to read and maintenance, poor style. Additionally, there are potential performance
issues, like no need to check weight ratio if minShare usage comparison already indicate the
order. It is worth to improve considering huge amount invokings in scheduler.



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