Wangda Tan created YARN-3026:

             Summary: Move application-specific container allocation logic from 
LeafQueue to FiCaSchedulerApp
                 Key: YARN-3026
             Project: Hadoop YARN
          Issue Type: Task
          Components: capacityscheduler
            Reporter: Wangda Tan
            Assignee: Wangda Tan

Have a discussion with [~vinodkv] and [~jianhe]: 

In existing Capacity Scheduler, all allocation logics of and under LeafQueue 
are located in in implementation. To make a cleaner scope of 
LeafQueue, we'd better move some of them to FiCaSchedulerApp.

Ideal scope of LeafQueue should be: when a LeafQueue receives some resources 
from ParentQueue (like 15% of cluster resource), and it distributes resources 
to children apps, and it should be agnostic to internal logic of children apps 
(like delayed-scheduling, etc.). IAW, LeafQueue shouldn't decide how 
application allocating container from given resources.

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