Jian He commented on YARN-6413:

Looks like the ApplicationServiceRecordKey etc. is still using the appId,  as 
said before, that will be in conflict with what exists today ? 

> Decouple Yarn Registry API from ZK
> ----------------------------------
>                 Key: YARN-6413
>                 URL: https://issues.apache.org/jira/browse/YARN-6413
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: amrmproxy, api, resourcemanager
>            Reporter: Ellen Hui
>            Assignee: Ellen Hui
>         Attachments: 0001-Registry-API-v2.patch, 0002-Registry-API-v2.patch, 
> 0003-Registry-API-api-only.patch
> Right now the Yarn Registry API (defined in the RegistryOperations interface) 
> is a very thin layer over Zookeeper. This jira proposes changing the 
> interface to abstract away the implementation details so that we can write a 
> FS-based implementation of the registry service, which will be used to 
> support AMRMProxy HA.
> The new interface will use register/delete/resolve APIs instead of 
> Zookeeper-specific operations like mknode. 

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