Junping Du created YARN-3276:

             Summary: Fix NPE and refactor in some map cast for TimelineEntity
                 Key: YARN-3276
                 URL: https://issues.apache.org/jira/browse/YARN-3276
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: timelineserver
            Reporter: Junping Du
            Assignee: Junping Du

Per discussion in YARN-3087, we need to refactor some similar logic to cast map 
to hashmap and get rid of NPE issue.

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