aajisaka opened a new pull request #2490:
URL: https://github.com/apache/hadoop/pull/2490


   JIRA: https://issues.apache.org/jira/browse/YARN-10499
   
   In the test, the groupSet is empty and `it.next()` throws 
NoSuchElementException.
   If the groupSet is empty, skip checking the set.


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