Wangda Tan commented on YARN-796:

Hi [~john.jian.fang],
Thanks for providing use cases.
bq. Why do users have to choose either decentralized or centralized label 
This is because cases like user may what to remove some static labels via 
dynamic API, and for next time RM restart, it will load static labels again. It 
will be hard to manage static/dynamic together, we need handling conflicts, etc.
bq. To me, the restful API could be more useful than the Admin UI.
I think both of them are very important in normal cases. RESTful API can be 
used by other management framework. Admin UI can be directly used by admin to 
tagging nodes.

> 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
>            Reporter: Arun C Murthy
>            Assignee: Wangda Tan
>         Attachments: LabelBasedScheduling.pdf, 
> Node-labels-Requirements-Design-doc-V1.pdf, YARN-796.patch
> 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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