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https://issues.apache.org/jira/browse/YARN-2394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14119379#comment-14119379
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Ashwin Shankar commented on YARN-2394:
--------------------------------------
Also, a subjective opinion(feel free to ignore the comment) - In the code
below, instead of passing a boolean, can we have the original
isStarvedFor(Fair|Min)Share which seems more readable to me and put the last
two lines of isStarved(boolean) into another method if you
think that would be redundant between isStarvedFor(Fair|Min)Share ?
{code:title=FSLeafQueue}
boolean isStarved(boolean checkMinShare) {
Resource share = checkMinShare ? getMinShare() :
Resources.multiply(getFairShare(), getFairSharePreemptionThreshold());
Resource desiredShare = Resources.min(scheduler.getResourceCalculator(),
scheduler.getClusterResource(), share, getDemand());
return Resources.lessThan(scheduler.getResourceCalculator(),
scheduler.getClusterResource(), getResourceUsage(), desiredShare);
}
{code}
> FairScheduler: Configure fairSharePreemptionThreshold per queue
> ---------------------------------------------------------------
>
> Key: YARN-2394
> URL: https://issues.apache.org/jira/browse/YARN-2394
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: fairscheduler
> Reporter: Ashwin Shankar
> Assignee: Wei Yan
> Attachments: YARN-2394-1.patch, YARN-2394-2.patch, YARN-2394-3.patch,
> YARN-2394-4.patch, YARN-2394-5.patch
>
>
> Preemption based on fair share starvation happens when usage of a queue is
> less than 50% of its fair share. This 50% is hardcoded. We'd like to make
> this configurable on a per queue basis, so that we can choose the threshold
> at which we want to preempt. Calling this config
> "fairSharePreemptionThreshold".
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