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https://issues.apache.org/jira/browse/YARN-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14307615#comment-14307615
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Robert Kanter commented on YARN-3040:
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Tags are basically just arbitrary strings you can "attach" with an application.
We had discussed the idea of specifying which applications belong to which
flow by adding a tagging them with the flow id. Tags were added in YARN-1461.
> implement client-side API for handling flows
> --------------------------------------------
>
> 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: Robert Kanter
>
> 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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