@Override
 public void run() throws Exception {
   if (memberInfos.size() == 3 && getNodeEngine().getThisAddress().getPort() % 3 == 0) {
     Thread.sleep(500);
   }
   super.run();
 }
 @Override
 public void write(ObjectDataOutput out, MemberInfoUpdateOperation object) throws IOException {
   object.writeData(out);
 }