Xiaoyu Yao created HADOOP-17079:
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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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