Daryn Sharp created HADOOP-13442:
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Summary: Optimize UGI group lookups
Key: HADOOP-13442
URL: https://issues.apache.org/jira/browse/HADOOP-13442
Project: Hadoop Common
Issue Type: Improvement
Reporter: Daryn Sharp
Assignee: Daryn Sharp
{{UGI#getGroups}} and its usage is inefficient. The list is unnecessarily
converted to multiple collections.
For _every_ invocation, the {{List<String>}} from the group provider is
converted into a {{LinkedHashSet<String>}} (to de-dup), back to a {{String[]}}.
Then callers testing for group membership convert back to a {{List<String>}}.
This should be done once to reduce allocations.
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