Varun Saxena commented on YARN-3051:

To elaborate on what getEntities API will do.

It will support filters similar to secondary filters by matching the info 
field. Yes, API would need to be enhanced to support queries based on config 
and metrics. I think it can be part of the same getEntities API.

As mentioned above, for config equality can be checked and for metrics all the 
relational operators will have to be supported.
We can probably have 2 additional parameters in the API, namely configFilters 
and metricsFilters. I guess that should do. 

I dont think there will be any other field on the basis of which filtering will 
be done.

> [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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