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https://issues.apache.org/jira/browse/YARN-3166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14329442#comment-14329442
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Li Lu commented on YARN-3166:
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Hello guys, sorry for the late reply...

bq. RM and NM modules will depend on timeline service module?
I agree that for RM, this is almost unavoidable. I think it's reasonable to let 
RM/NMs (in future) depend on timeline services, but we need to be careful on 
cyclic dependencies? 

bq. What is the difference between TimelineStorage and TimelineStorageImpl?
We may need some renaming here. In my original thought, TimelineStorage class 
translates operations based on our object model to data storage layer method 
calls. These methods should be implemented by a TimelineStorageImpl object (and 
its subclasses, of course). 

> [Source organization] Decide detailed package structures for timeline service 
> v2 components
> -------------------------------------------------------------------------------------------
>
>                 Key: YARN-3166
>                 URL: https://issues.apache.org/jira/browse/YARN-3166
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Li Lu
>            Assignee: Li Lu
>
> Open this JIRA to track all discussions on detailed package structures for 
> timeline services v2. This JIRA is for discussion only.
> For our current timeline service v2 design, aggregator (previously called 
> "writer") implementation is in hadoop-yarn-server's:
> {{org.apache.hadoop.yarn.server.timelineservice.aggregator}}
> In YARN-2928's design, the next gen ATS reader is also a server. Maybe we 
> want to put reader related implementations into hadoop-yarn-server's:
> {{org.apache.hadoop.yarn.server.timelineservice.reader}}
> Both readers and aggregators will expose features that may be used by YARN 
> and other 3rd party components, such as aggregator/reader APIs. For those 
> features, maybe we would like to expose their interfaces to 
> hadoop-yarn-common's {{org.apache.hadoop.yarn.timelineservice}}? 
> Let's use this JIRA as a centralized place to track all related discussions. 



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