Konstantinos Karanasos commented on YARN-2882:

[~Sujeet Varakhedi] The scope of pre-emption/killing is not only within an 
application. Whenever a guaranteed-start task arrives in an NM that cannot 
accommodate its execution due to running queueable tasks, it is allowed to 
pre-empt/kill one or more of those, even if they belong to another application.
Clearly there can be policies that decide which of the running queueable tasks 
to pre-empt/kill (and one of them could be to avoid pre-empting/killing a task 
of another application, if there is a good reason for that).

> Introducing container types
> ---------------------------
>                 Key: YARN-2882
>                 URL: https://issues.apache.org/jira/browse/YARN-2882
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>            Reporter: Konstantinos Karanasos
> This JIRA introduces the notion of container types.
> We propose two initial types of containers: guaranteed-start and queueable 
> containers.
> Guaranteed-start are the existing containers, which are allocated by the 
> central RM and are instantaneously started, once allocated.
> Queueable is a new type of container, which allows containers to be queued in 
> the NM, thus their execution may be arbitrarily delayed.

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