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https://issues.apache.org/jira/browse/YARN-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564301#comment-14564301
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Xianyin Xin commented on YARN-314:
----------------------------------

A little more: we can limit a form only specify one type priority, location and 
capacity, to lighten the management difficulty. If AM want more types of 
priority, location and capacity, they can submit more forms. Form is the unit 
we deal with resource request.

> Schedulers should allow resource requests of different sizes at the same 
> priority and location
> ----------------------------------------------------------------------------------------------
>
>                 Key: YARN-314
>                 URL: https://issues.apache.org/jira/browse/YARN-314
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>    Affects Versions: 2.0.2-alpha
>            Reporter: Sandy Ryza
>            Assignee: Karthik Kambatla
>         Attachments: yarn-314-prelim.patch
>
>
> Currently, resource requests for the same container and locality are expected 
> to all be the same size.
> While it it doesn't look like it's needed for apps currently, and can be 
> circumvented by specifying different priorities if absolutely necessary, it 
> seems to me that the ability to request containers with different resource 
> requirements at the same priority level should be there for the future and 
> for completeness sake.



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