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https://issues.apache.org/jira/browse/YARN-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod Kumar Vavilapalli updated YARN-4183:
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    Fix Version/s:     (was: 2.7.2)
                       (was: 2.8.0)
                       (was: 3.0.0)

bq. All of this needs more work, so unless I hear strongly otherwise I am going 
to revert this patch in the interest of 2.7.2's progress.
Seeing no No's, reverted this for the sake of 2.7.2.

> Enabling generic application history forces every job to get a timeline 
> service delegation token
> ------------------------------------------------------------------------------------------------
>
>                 Key: YARN-4183
>                 URL: https://issues.apache.org/jira/browse/YARN-4183
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Mit Desai
>            Assignee: Mit Desai
>         Attachments: YARN-4183.1.patch
>
>
> When enabling just the Generic History Server and not the timeline server, 
> the system metrics publisher will not publish the events to the timeline 
> store as it checks if the timeline server and system metrics publisher are 
> enabled before creating a timeline client.
> To make it work, if the timeline service flag is turned on, it will force 
> every yarn application to get a delegation token.
> Instead of checking if timeline service is enabled, we should be checking if 
> application history server is enabled.



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