Vrushali C commented on YARN-3167:

Related: Attached on YARN-3031 a sequence diagram that reflects the 
interactions for writing between the AM, the base aggregator service, the 
timeline service writer api and backend store.


> implement the core functionality of the base aggregator service
> ---------------------------------------------------------------
>                 Key: YARN-3167
>                 URL: https://issues.apache.org/jira/browse/YARN-3167
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
> The basic skeleton of the timeline aggregator has been set up by YARN-3030. 
> We need to implement the core functionality of the base aggregator service. 
> The key things include
> - handling the requests from clients (sync or async)
> - buffering data
> - handling the aggregation logic
> - invoking the storage API

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