Vinayakumar B created HADOOP-17505:
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Summary: public interface GroupMappingServiceProvider needs
default impl for getGroupsSet()
Key: HADOOP-17505
URL: https://issues.apache.org/jira/browse/HADOOP-17505
Project: Hadoop Common
Issue Type: Bug
Reporter: Vinayakumar B
HADOOP-17079 added "GroupMappingServiceProvider#getGroupsSet()" interface.
But since this is a public interface, it will break compilation of existing
implementations in downstreams.
Consider adding a default implementation in the interface to avoid such
failures.
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