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https://issues.apache.org/jira/browse/YARN-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380635#comment-14380635
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Junping Du commented on YARN-3040:
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bq. How about we check if cluster-id is set, and if not, generate one like 
cluster-<rm-start-timestamp> without having a default value per se?
That make sense. However, I think we should fix it in trunk branch. May be we 
should file a separated JIRA to track that?

> [Data Model] Make putEntities operation be aware of the app's context
> ---------------------------------------------------------------------
>
>                 Key: YARN-3040
>                 URL: https://issues.apache.org/jira/browse/YARN-3040
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Zhijie Shen
>         Attachments: YARN-3040.1.patch, YARN-3040.2.patch, YARN-3040.3.patch, 
> YARN-3040.4.patch, YARN-3040.5.patch
>
>
> Per design in YARN-2928, implement client-side API for handling *flows*. 
> Frameworks should be able to define and pass in all attributes of flows and 
> flow runs to YARN, and they should be passed into ATS writers.
> YARN tags were discussed as a way to handle this piece of information.



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