Ashwin Shankar created YARN-2395:

             Summary: Fair Scheduler : implement fair share preemption at 
parent queue based on fairSharePreemptionTimeout
                 Key: YARN-2395
             Project: Hadoop YARN
          Issue Type: New Feature
          Components: fairscheduler
            Reporter: Ashwin Shankar

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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