Varun Saxena commented on YARN-3051:

bq. Overwriting the row of appId? Appending one more row of appId? 
No. cluster1 will have a different directory and cluster2 a different one.
I mean if default root directory is {{/tmp/timeline_service_data}} and 2 
cluster ids', we will have one app flow mapping file at location 
{{/tmp/timeline_service_data/cluster1/app_flow_mapping.csv}} and other one will 
be {{/tmp/timeline_service_data/cluster2/app_flow_mapping.csv}}

> [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
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Varun Saxena
>         Attachments: YARN-3051-YARN-2928.003.patch, 
> YARN-3051-YARN-2928.03.patch, YARN-3051-YARN-2928.04.patch, 
> YARN-3051-YARN-2928.05.patch, YARN-3051-YARN-2928.06.patch, 
> YARN-3051-YARN-2928.07.patch, YARN-3051-YARN-2928.08.patch, 
> YARN-3051.Reader_API.patch, YARN-3051.Reader_API_1.patch, 
> YARN-3051.Reader_API_2.patch, YARN-3051.Reader_API_3.patch, 
> YARN-3051.Reader_API_4.patch, YARN-3051.wip.02.YARN-2928.patch, 
> 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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