@Override
    public void postStartMaster(ObserverContext<MasterCoprocessorEnvironment> ctx) {
      // Do nothing. In particular, stop the creation of the hbase:acl table. It makes the
      // shutdown take time.
    }
This tests to validate the HMaster's ConnectorServer after unauthorised shutdown call.
hbase-server/src/test/java/org/apache/hadoop/hbase/TestJMXConnectorServer.java