private static void sendRegistrationMessage(DataSerializer s) {
    InternalDistributedSystem system = InternalDistributedSystem.getConnectedInstance();
    if (system != null) {
      RegistrationMessage m = new RegistrationMessage(s);
      system.getDistributionManager().putOutgoing(m);
    }
  }
If we are connected to a distributed system, send a message to other members telling them about
a newly-registered serializer.
geode-core/src/main/java/org/apache/geode/internal/InternalDataSerializer.java