Wangda Tan updated YARN-2920:
    Attachment: YARN-2920.4.patch

Thanks for your comments, I've updated patch addressed all your suggestions, 
for your comment:

bq. how about containers running on a node without label, and now we are adding 
a label.
Now we will also kill containers on that node, this will be changed after we 
get YARN-2498 in. I added a TODO note at 

Please kindly review,


> CapacityScheduler should be notified when labels on nodes changed
> -----------------------------------------------------------------
>                 Key: YARN-2920
>                 URL: https://issues.apache.org/jira/browse/YARN-2920
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2920.1.patch, YARN-2920.2.patch, YARN-2920.3.patch, 
> YARN-2920.4.patch
> Currently, labels on nodes changes will only be handled by 
> RMNodeLabelsManager, but that is not enough upon labels on nodes changes:
> - Scheduler should be able to do take actions to running containers. (Like 
> kill/preempt/do-nothing)
> - Used / available capacity in scheduler should be updated for future 
> planning.
> We need add a new event to pass such updates to scheduler

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