[jira] [Created] (YARN-3026) Move application-specific container allocation logic from LeafQueue to FiCaSchedulerApp

["Wangda Tan (JIRA)" <ji...@apache.org>]

Wangda Tan created YARN-3026:
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             Summary: Move application-specific container allocation logic from LeafQueue to FiCaSchedulerApp
                 Key: YARN-3026
                 URL: https://issues.apache.org/jira/browse/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 LeafQueue.java 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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