Li Lu commented on YARN-4074:

Hi [~sjlee0] [~vrushalic], thanks for the work and sorry I could not get back 
earlier. Overall the patch LGTM. I like the refactor here and it's almost a 
must to put it in soon. One nit is, on naming and code organization, we're 
putting all derived readers in the storage package, but inevitably associating 
them with our (specific) HBase storage. If it's quick and easy, maybe we can 
put them in a package inside storage? If I'm missing anything here and it's 
hard, let proceed with this patch. Your call. 

> [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
>         Attachments: YARN-4074-YARN-2928.007.patch, 
> YARN-4074-YARN-2928.008.patch, YARN-4074-YARN-2928.POC.001.patch, 
> YARN-4074-YARN-2928.POC.002.patch, YARN-4074-YARN-2928.POC.003.patch, 
> YARN-4074-YARN-2928.POC.004.patch, YARN-4074-YARN-2928.POC.005.patch, 
> YARN-4074-YARN-2928.POC.006.patch
> 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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