Varun Saxena commented on YARN-3051:

bq. I think it's a good idea to let the user-oriented interface to have more 
specific/advanced APIs to handle the special entity objects, the storage 
interface could have fewer, more uniformed APIs to reuse the common logic as 
much as possible. Thoughts?
After adding a lot of similar APIs' even I am of the same view. A lot more 
detail can be added in javadoc.
This would reduce code bloating. 

> [Storage abstraction] Create backing storage read interface for ATS readers
> ---------------------------------------------------------------------------
>                 Key: YARN-3051
>                 URL: https://issues.apache.org/jira/browse/YARN-3051
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Varun Saxena
>         Attachments: YARN-3051-YARN-2928.003.patch, 
> YARN-3051-YARN-2928.03.patch, YARN-3051-YARN-2928.04.patch, 
> YARN-3051.wip.02.YARN-2928.patch, YARN-3051.wip.patch, YARN-3051_temp.patch
> Per design in YARN-2928, create backing storage read interface that can be 
> implemented by multiple backing storage implementations.

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