Naganarasimha G R commented on YARN-3565:

Hi [~wangda], I would like to work on this jira and i was also similarly 
thinking  in distributed case how to support  exclusivity/constraints ! 

> NodeHeartbeatRequest/RegisterNodeManagerRequest should use NodeLabel object 
> instead of String
> ---------------------------------------------------------------------------------------------
>                 Key: YARN-3565
>                 URL: https://issues.apache.org/jira/browse/YARN-3565
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, client, resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>            Priority: Blocker
> Now NM HB/Register uses Set<String>, it will be hard to add new fields if we 
> want to support specifying NodeLabel type such as exclusivity/constraints, 
> etc. We need to make sure rolling upgrade works.

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