Karthik Kambatla commented on YARN-2395:

bq. I removed the old "defaultFairSharePreemptionTimeout" and added a new one 
This would be backwards incompatible. I propose we leave it as is, but add more 
documentation to help understand - If a preemption-timeout is not specified, 
the queues would inherit their parent's timeout, and the root queue uses the 

> Fair Scheduler : implement fair share preemption at parent queue based on 
> fairSharePreemptionTimeout
> ----------------------------------------------------------------------------------------------------
>                 Key: YARN-2395
>                 URL: https://issues.apache.org/jira/browse/YARN-2395
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: fairscheduler
>            Reporter: Ashwin Shankar
>            Assignee: Wei Yan
>         Attachments: YARN-2395-1.patch
> Currently in fair scheduler, the preemption logic considers fair share 
> starvation only at leaf queue level. This jira is created to implement it at 
> the parent queue as well.
> It involves :
> 1. Making "check for fair share starvation" and "amount of resource to 
> preempt"  recursive such that they traverse the queue hierarchy from root to 
> leaf.
> 2. Currently fairSharePreemptionTimeout is a global config. We could make it 
> configurable on a per queue basis,so that we can specify different timeouts 
> for parent queues.

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