Li Lu commented on YARN-4074:

bq. This also implies that the canonical stores for the flows and the flow runs 
are the flow activity table and the flow run table respectively...
Ah right... This makes the unified interface less appealing since we may need 
to branch a lot with the getEntities method. However, if we proceed in this 
direction, maybe we'd like to do a deeper refactor of that code. 

> [timeline reader] implement support for querying for flows and flow runs
> ------------------------------------------------------------------------
>                 Key: YARN-4074
>                 URL: https://issues.apache.org/jira/browse/YARN-4074
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
> Implement support for querying for flows and flow runs.
> We should be able to query for the most recent N flows, etc.
> This includes changes to the {{TimelineReader}} API if necessary, as well as 
> implementation of the API.

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