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Wilfred Spiegelenburg commented on YARN-9019: --------------------------------------------- Change looks good +1 (non binding) > 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org