Yuliya Feldman commented on YARN-796:

I am out of country now with very poor internet connectivity, so won't be able 
to answer comprehensively.
To: [~ste...@apache.org]
Really appreciate your comments
I definitely agree with majority of the comments you made. Especially with how 
much code it takes to add a single method to rmadmin command - may be we missed 
something, but it is really too much.
regarding wrapper on top of LabelManager to behave as a service - in realy life 
situation service is instantiated once per process - which is exactly what we 
need, as it is really a singleton, but since UnitTests create service per unit 
test it created issues with Service  States in this case.
About waiting for 6 secs between tests - allowing labels ile to reload - can be 
reduced further.

> Allow for (admin) labels on nodes and resource-requests
> -------------------------------------------------------
>                 Key: YARN-796
>                 URL: https://issues.apache.org/jira/browse/YARN-796
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.4.1
>            Reporter: Arun C Murthy
>            Assignee: Wangda Tan
>         Attachments: LabelBasedScheduling.pdf, 
> Node-labels-Requirements-Design-doc-V1.pdf, YARN-796.patch, YARN-796.patch4
> It will be useful for admins to specify labels for nodes. Examples of labels 
> are OS, processor architecture etc.
> We should expose these labels and allow applications to specify labels on 
> resource-requests.
> Obviously we need to support admin operations on adding/removing node labels.

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