HADOOP-17669. Backport HADOOP-17079, HADOOP-17505 to branch-3.3#2959

Merged

jojochuang merged 2 commits intoapache:branch-3.3from

jojochuang:HADOOP-17669

May 18, 2021

Commits on Apr 27, 2021

HADOOP-17079. Optimize UGI#getGroups by adding UGI#getGroupsSet.

xiaoyuyao
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jojochuang
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HADOOP-17505. public interface GroupMappingServiceProvider needs default impl for getGroupsSet() (#2661). Contributed by Vinayakumar B.

vinayakumarb
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jojochuang
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