Mit Desai created YARN-4183:

             Summary: Enabling generic application history forces every job to 
get a timeline service delegation token
                 Key: YARN-4183
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.7.1
            Reporter: Mit Desai
            Assignee: Mit Desai

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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