Wangda Tan updated YARN-4026:
    Attachment: YARN-4026.3.patch

Attached ver.3, added more comments and fixed findbugs warning.

> FiCaSchedulerApp: ContainerAllocator should be able to choose how to order 
> pending resource requests
> ----------------------------------------------------------------------------------------------------
>                 Key: YARN-4026
>                 URL: https://issues.apache.org/jira/browse/YARN-4026
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-4026.1.patch, YARN-4026.2.patch, YARN-4026.3.patch
> 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 
> one thing in existing logic not flexible enough:
> - ContainerAllocator decides what to allocate for a given node and priority: 
> 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 pending resource requests.

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