Xiaoyu Yao created HADOOP-17079:

             Summary: Optimize UGI#getGroups by adding UGI#getGroupsSet
                 Key: HADOOP-17079
                 URL: https://issues.apache.org/jira/browse/HADOOP-17079
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao

UGI#getGroups has been optimized with HADOOP-13442 by avoiding the 
List->Set->List conversion. However the returned list is not optimized to 
contains lookup. This ticket is opened to add a UGI#getGroupsSet and use 
Set#contains() instead of List#contains() to speed up large group look up. 

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