amahussein opened a new pull request #2631:
URL: https://github.com/apache/hadoop/pull/2631


   Porting to Hadoop-2.10 three commits related to Groups.
   
   HADOOP-13965. Groups should be consistent in using default group mapp…  
[383aa9c](https://github.com/apache/hadoop/commit/383aa9c9f55983cdb1c225b2ed22f6f48616cb9c)
   HDFS-13723. Occasional "Should be different group" error in TestRefre… 
[162228e](https://github.com/apache/hadoop/commit/162228e8db937d4bdb9cf61d15ed555f1c96368f)
   HADOOP-17079. Optimize UGI#getGroups by adding UGI#getGroupsSet. 
[f91a8ad](https://github.com/apache/hadoop/commit/f91a8ad88b00b50231f1ae3f8820a25c963bb561)
 (#2085)
   
   CC: @linyiqun @smengcl @xiaoyuyao @jojochuang @jbrennan333 


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