Sunil G updated YARN-3224:
    Attachment: 0002-YARN-3224.patch

Attaching an initial version of patch.

Small summary of this patch:

1. When a node is marked for DECOMMISSIONING, an event will be fired to 
Capacity Scheduler to preempt all containers running in that node.
2. In CS, a new event is added for this. And all existing *preemptContainer* 
api is invoked for all running container of the node.

Its possible that few AM containers are also marked for preemption. This 
current patch gives only a PREEMPT_CONTAINER notification to AM. Timeout is not 
added for now as YARN-3784 is yet to be concluded.

Could you please take a look.

> Notify AM with containers (on decommissioning node) could be preempted after 
> timeout.
> -------------------------------------------------------------------------------------
>                 Key: YARN-3224
>                 URL: https://issues.apache.org/jira/browse/YARN-3224
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Junping Du
>            Assignee: Sunil G
>         Attachments: 0001-YARN-3224.patch, 0002-YARN-3224.patch
> We should leverage YARN preemption framework to notify AM that some 
> containers will be preempted after a timeout.

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