Junping Du created YARN-4527:

             Summary: Possible thread leak if TimelineClient.start() get called 
multiple times.
                 Key: YARN-4527
                 URL: https://issues.apache.org/jira/browse/YARN-4527
             Project: Hadoop YARN
          Issue Type: Bug
          Components: timelineserver
    Affects Versions: 2.8.0
            Reporter: Junping Du
            Assignee: Junping Du

Since YARN-4234, we involve TimelineClient start and stop that would create 
different TimelineWriter according to the configuration. serviceStart() will 
create a TimelineWriter instance every time which will spawn several timer 
threads afterwards. If one TimelineClient get call start() multiple times for 
some reason (application bug or intentionally in some cases), the spawned timer 
threads will get leak.

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