Zhijie Shen created YARN-2867:

             Summary: TimelineClient DT methods should check if the timeline 
service is enabled or not
                 Key: YARN-2867
                 URL: https://issues.apache.org/jira/browse/YARN-2867
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Zhijie Shen

DT related methods doesn't check if isEnabled == true. On the other side, the 
internal stuff is only inited when isEnabled == true. NPE happens if users call 
these methods when the timeline service config is not set to enabled.

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