Wangda Tan created YARN-4026:

             Summary: FiCaSchedulerApp: Revisit ContainerAllocator interface 
                 Key: YARN-4026
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Wangda Tan
            Assignee: Wangda Tan

After YARN-3983, we have an extensible ContainerAllocator which can be used by 
FiCaSchedulerApp to decide how to allocate resources.

While working on YARN-1651 (allocate resource to increase container), I found 
existing logic:
- ContainerAllocator decides what to allocate for a given node and priority, 
it's not flexible enough: To support different kinds of resource allocation, 
for example, priority as weight / skip priority or not, etc. It's better to let 
ContainerAllocator to choose how to order resource request according to 

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