Zhijie Shen commented on YARN-3051:

Yeah, I meant to be AND logic for these parameters. I think it's good to be 
declare explicitly.

To extend the parameter, we can add more parameter like AND and OR. I agree 
it's good to take a look at HBase filter abstraction, and draft ours 
accordingly. I consider them as the code improvement of filter abstraction, but 
other than it, hopefully we can agree on using these filters.

bq. Probably obvious, but once ALL is specified, all fields will be returned, 
even if only some Fields are specified and others not.


> [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.Reader_API.patch, YARN-3051.Reader_API_1.patch, 
> YARN-3051.Reader_API_2.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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