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Posted to yarn-issues@hadoop.apache.org by "Tao Yang (JIRA)" <ji...@apache.org> on 2018/11/10 10:57:00 UTC
[jira] [Commented] (YARN-7461) DominantResourceCalculator#ratio
calculation problem when right resource contains zero value
[ https://issues.apache.org/jira/browse/YARN-7461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682339#comment-16682339 ]
Tao Yang commented on YARN-7461:
--------------------------------
Hi, [~sunilg], [~leftnoteasy], [~templedf], [~cheersyang].
Can we keep talking about this issue? This issue is important for us to avoid errors when clients parse scheduler REST API and the response body contains NaN.
> 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, YARN-7461.004.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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