Eights-Li opened a new pull request #3069:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/3069

   ## What is the purpose of the pull request
   *fix single yarn get application status failed*
   deploy dolphin scheduler in single yarn hadoop cluster, 
   exec a yarn job will lead npe when get the yarn app status 
   ## Brief change log
     - *Modify HadoopUtils*
   ## Verify this pull request
   This pull request is already covered by existing tests, such as:

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