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* HADOOP-17079. Optimize UGI#getGroups by adding UGI#getGroupsSet. Co-authored-by: Wei-Chiu Chuang <weichiu@apache.org> Change-Id: I0f31409923ece24a82dfba4c4610d8a38c52d9fb * HADOOP-17505. public interface GroupMappingServiceProvider needs default impl for getGroupsSet() (#2661). Contributed by Vinayakumar B. (cherry picked from commit c4c0683dff577a91ca978939e182ec0fee65b7c3) Co-authored-by: Xiaoyu Yao <xyao@apache.org> Co-authored-by: Vinayakumar B <vinayakumarb@apache.org>