Zhijie Shen commented on YARN-3051:

Thanks for summarize the proposal, Sangjin! Just think it out loudly. My major 
concern about this proposal is compatibility. Previously in v1, timeline entity 
is globally unique, such that when fetching a single entity before, users only 
need to provide <entity type, entity id>. <app id, entity type, entity id> is 
required to locate one entity, and theoretically  <null, entity type, entity 
id> will refer to multiple entities. It probably makes difficult to be 
compatible to existing use cases.

/cc [~hitesh]

> [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
>            Reporter: Sangjin Lee
>            Assignee: Varun Saxena
>         Attachments: 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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