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From "Tao Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-7461) DominantResourceCalculator#ratio calculation problem when right resource contains zero value
Date Thu, 16 Nov 2017 06:48:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-7461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tao Yang updated YARN-7461:
---------------------------
    Attachment: YARN-7461.003.patch

Updating the patch to skip ratio calculation for resource types whose left value and right
value are both zero. [~templedf], could you help to review please?

> DominantResourceCalculator#ratio calculation problem when right resource contains zero
value
> --------------------------------------------------------------------------------------------
>
>                 Key: YARN-7461
>                 URL: https://issues.apache.org/jira/browse/YARN-7461
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 3.0.0-alpha4
>            Reporter: Tao Yang
>            Assignee: Tao Yang
>            Priority: Minor
>         Attachments: YARN-7461.001.patch, YARN-7461.002.patch, YARN-7461.003.patch
>
>
> Currently DominantResourceCalculator#ratio may return wrong result when right resource
contains zero value. For example, there are three resource types such as <memory-mb, vcores,
vssd>, leftResource=<5, 5, 0> and rightResource=<10, 10, 0>, we expect the
result of DominantResourceCalculator#ratio(leftResource, rightResource) is 0.5 but currently
is NaN.
> There should be a verification before divide calculation to ensure that dividend is not
zero.



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