Anubhav Dhoot created YARN-1909:
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Summary: FairScheduler isStartvedForFairShare does not work when
fairShare == 1
Key: YARN-1909
URL: https://issues.apache.org/jira/browse/YARN-1909
Project: Hadoop YARN
Issue Type: Bug
Reporter: Anubhav Dhoot
Assignee: Anubhav Dhoot
If the fair share returned by the scheduler getFairShare() == 1 the pool will
never be marked as being starved because of the following calculation:
boolean isStarvedForFairShare(PoolSchedulable sched) { int desiredFairShare =
(int) Math.floor(Math.min( sched.getFairShare() / 2, sched.getDemand()));
return (sched.getRunningTasks() < desiredFairShare); }
getFairShare() returns 1
Math.min calculation will return 0.5
Math.Floor() which will cause the desiredFairShare to be set to 0.
the return value to be 'false' (0 < 0)
If you have a small job without a minimum set it will not get scheduled if a
large job is hogging the slots.
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