Wangda Tan commented on YARN-1651:

[~mding], I think for your last example, if RM decides to rollback resources, 
it should send a container decrease event to NM as well, NM can ignore the 
decrease event if target size of container is equals to existing container 
size. Sounds like a plan? 

> CapacityScheduler side changes to support increase/decrease container 
> resource.
> -------------------------------------------------------------------------------
>                 Key: YARN-1651
>                 URL: https://issues.apache.org/jira/browse/YARN-1651
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager, scheduler
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-1651-1.YARN-1197.patch

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