RefreshUserMappingsProtocol refreshProtocol =
NameNodeProxies.createProxy(conf, FileSystem.getDefaultUri(conf),
RefreshUserMappingsProtocol.class).getProxy();
// Refresh the user-to-groups mappings
refreshProtocol.refreshUserToGroupsMappings();
System.out.println("Refresh user to groups mapping successful");
}
return 0;
}