https://hadoop.apache.org/docs/r2.8.2/hadoop-project-dist/hadoop-common/api/org/apache/hadoop/security/proto/RefreshUserMappingsProtocolProtos.RefreshUserMappingsProtocolService.html
RefreshUserMappingsProtocolProtos.RefreshUserMappingsProtocolService (Apache Hadoop Common 2.8.2...
apache hadoopcommon