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https://issues.apache.org/jira/browse/YARN-6299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15905920#comment-15905920
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Daniel Templeton commented on YARN-6299:
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Hmmm... Thinking about it a little further, I'm not sure it actually matters
that much which one we prefer. They're both under the min share, so scheduling
either one is fine... Maybe?
> FairSharePolicy is incorrect when demand is less than min share
> ---------------------------------------------------------------
>
> Key: YARN-6299
> URL: https://issues.apache.org/jira/browse/YARN-6299
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 3.0.0-alpha2
> Reporter: Daniel Templeton
>
> {code}
> Resource resourceUsage1 = s1.getResourceUsage();
> Resource resourceUsage2 = s2.getResourceUsage();
> Resource minShare1 = Resources.min(RESOURCE_CALCULATOR, null,
> s1.getMinShare(), s1.getDemand());
> Resource minShare2 = Resources.min(RESOURCE_CALCULATOR, null,
> s2.getMinShare(), s2.getDemand());
> boolean s1Needy = Resources.lessThan(RESOURCE_CALCULATOR, null,
> resourceUsage1, minShare1);
> boolean s2Needy = Resources.lessThan(RESOURCE_CALCULATOR, null,
> resourceUsage2, minShare2);
> minShareRatio1 = (double) resourceUsage1.getMemorySize()
> / Resources.max(RESOURCE_CALCULATOR, null, minShare1,
> ONE).getMemorySize();
> minShareRatio2 = (double) resourceUsage2.getMemorySize()
> / Resources.max(RESOURCE_CALCULATOR, null, minShare2,
> ONE).getMemorySize();
> {code}
> If demand is less than min share, then an app will be flagged as needy if it
> has demand that is higher than its usage, which happens any time the app has
> been assigned resources that it hasn't started using yet. That sounds wrong
> to me. [~kasha], [~yufeigu]?
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