Gour Saha commented on YARN-7939:

bq. There is no {{NEEDS_UPGRADE}} state at service level, so the json that you 
posted in your example for service level is incorrect.

[~csingh], shouldn't the API submission itself have thrown validation error 
since ServiceState NEEDS_UPGRADE does not even exist?

> Yarn Service Upgrade: add support to upgrade a component instance 
> ------------------------------------------------------------------
>                 Key: YARN-7939
>                 URL: https://issues.apache.org/jira/browse/YARN-7939
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Chandni Singh
>            Assignee: Chandni Singh
>            Priority: Major
>         Attachments: YARN-7939.001.patch, YARN-7939.002.patch, 
> YARN-7939.003.patch
> Yarn core supports in-place upgrade of containers. A yarn service can 
> leverage that to provide in-place upgrade of component instances. Please see 
> YARN-7512 for details.
> Will add support to upgrade a single component instance first and then 
> iteratively add other APIs and features.

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