}
}
@Test
public void testGroupMappingRefresh() throws Exception {
MRAdmin admin = new MRAdmin(config);
String [] args = new String[] { "-refreshUserToGroupsMappings" };
Groups groups = Groups.getUserToGroupsMappingService(config);
String user = UserGroupInformation.getLoginUser().getShortUserName();
System.out.println("first attempt:");
List<String> g1 = groups.getGroups(user);
String [] str_groups = new String [g1.size()];
g1.toArray(str_groups);
System.out.println(Arrays.toString(str_groups));
System.out.println("second attempt, should be same:");
List<String> g2 = groups.getGroups(user);
g2.toArray(str_groups);
System.out.println(Arrays.toString(str_groups));
for(int i=0; i<g2.size(); i++) {
assertEquals("Should be same group ", g1.get(i), g2.get(i));
}
// run refresh command
admin.run(args);
System.out.println("third attempt(after refresh command), should be different:");
List<String> g3 = groups.getGroups(user);
g3.toArray(str_groups);
System.out.println(Arrays.toString(str_groups));