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Posted to yarn-issues@hadoop.apache.org by "Haibo Chen (JIRA)" <ji...@apache.org> on 2018/12/05 23:16:00 UTC
[jira] [Commented] (YARN-9019) Ratio calculation of
ResourceCalculator implementations could return NaN
[ https://issues.apache.org/jira/browse/YARN-9019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710731#comment-16710731 ]
Haibo Chen commented on YARN-9019:
----------------------------------
+1 checking in shortly
> Ratio calculation of ResourceCalculator implementations could return NaN
> ------------------------------------------------------------------------
>
> Key: YARN-9019
> URL: https://issues.apache.org/jira/browse/YARN-9019
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Szilard Nemeth
> Assignee: Szilard Nemeth
> Priority: Major
> Attachments: YARN-9019.001.patch
>
>
> Found out that ResourceCalculator.ratio (with implementors DefaultResourceCalculator and DominantResourceCalculator) can produce NaN (Not-A-Number) as a result.
> This is because [IEEE 754|http://grouper.ieee.org/groups/754/] defines {{1.0 / 0.0}} as Infinity and {{-1.0 / 0.0}} as -Infinity and {{0.0 / 0.0}} as NaN, see here: [https://stackoverflow.com/a/14138032/1106893]
> I think it's very dangerous to rely on NaN can be returned from ratio calculations and this could have side-effects.
> When ratio calculates the result and if both the numerator and the denominator is zero, we should use 0 as a result, I think.
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