@Override
  public void writeAdditionalData(DataOutput out) throws IOException {
    out.writeLong(uuidMSBs);
    out.writeLong(uuidLSBs);
    out.write(memberWeight);
  }
checks to see if this address has UUID information needed to send messages via JGroups
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/GMSMemberData.java