Varun Saxena commented on YARN-4074:

The patch looks fine to me. I tested some parts related to flow as well.

I see that in flow activity table, the row key is cluster id followed by an 
inverted timestamp. This I guess is to retrieve entities by a certain time 
range. I havent added this in REST related JIRA and dont see support even here. 
Will handle it after PoC I guess. Correct ?
Also I had added user as an optional query param in REST API code. I think 
querying by user wont really be a good idea looking at the row key. Will remove 

The major code added in this patch is about the different readers based on 
table and a factory. It looks fine. However, number of parameters to the 
methods are quite a lot just like Reader API. As you mentioned elsewhere, maybe 
I can refactor this later. We should club together some things into logical 
things like context, filters, etc. That will reduce number of params.

In the factory class, we have a sequence of if-else statements. Although its a 
matter of perspective, sequence of if-else look a little inelegant. But we may 
not have too many great options here. Thought of enums i.e. having create 
methods with implementation tied to each enum but entity type enum is not HBase 
specific. Any other option ? I guess if-else should be fine for now because not 
too many tables should be added in future, if any.

In xxxEntityReader classes, maybe createTable should be renamed to getTable 
because we are not really creating any table here. We are just getting/creating 
a table object. 
Also if I am not wrong, no need to create this object again and again as well. 
All it really holds is static information such as table name and conf.

> [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.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
> 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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