Daryn Sharp created HADOOP-14659:
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Summary: UGI getShortUserName does not need to search the Subject
Key: HADOOP-14659
URL: https://issues.apache.org/jira/browse/HADOOP-14659
Project: Hadoop Common
Issue Type: Improvement
Components: common
Affects Versions: 2.0.0-alpha
Reporter: Daryn Sharp
Assignee: Daryn Sharp
{{UGI#getShortUserName}} searches the subject for the {{User}} instance. It's
not cheap to iterate a synchronized set, copy matches into a new set, then
iterating that set. The UGI ctor already set the {{User}} into a final field...
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