Varun Saxena commented on YARN-3051:

bq. We may not only need to do queries for timeline entities, but also 
something solely for their configs and/or metrics
But IIUC, metrics and configs would still be tied to or encapsulated inside an 
entity. The entity may be a cluster or it may be an application or something 
So when I say get all configs for an app. I do that by specifying 
fields=configs in REST URL. And if I want metrics and configs for an app, I can 
say fields=configs,metrics.

> [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
>            Reporter: Sangjin Lee
>            Assignee: Varun Saxena
> Per design in YARN-2928, create backing storage read interface that can be 
> implemented by multiple backing storage implementations.

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