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https://issues.apache.org/jira/browse/YARN-9019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710772#comment-16710772
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Hudson commented on YARN-9019:
------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #15566 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/15566/])
YARN-9019. Ratio calculation of ResourceCalculator implementations could
(haibochen: rev 912b1f9d64a61ef2663d95e2b4f286e6ee8d5ff9)
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResourceCalculator.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/DominantResourceCalculator.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/ResourceCalculator.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/DefaultResourceCalculator.java
> 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
> Fix For: 3.3.0
>
> 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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