code: public static byte[] getQueueRowPrefix(QueueName queueName) {
      if (queueName.isStream()) {
        // NOTE: stream is uniquely identified by table name
        return Bytes.EMPTY_BYTE_ARRAY;
      }
      String flowlet = queueName.getThirdComponent();
      String output = queueName.getSimpleName();
      byte[] idWithinFlow = (flowlet + "/" + output).getBytes(Charsets.US_ASCII);
  
      return getQueueRowPrefix(idWithinFlow);
    }
docs: Returns a byte array representing prefix of a queue. The prefix is formed by first two bytes of
  MD5 of the queue name followed by the queue name.