code: private static byte[] getQueueRowPrefix(byte[] queueIdWithinFlow) {
      byte[] bytes = new byte[queueIdWithinFlow.length + 1];
      Hashing.md5().hashBytes(queueIdWithinFlow).writeBytesTo(bytes, 0, 1);
      System.arraycopy(queueIdWithinFlow, 0, bytes, 1, queueIdWithinFlow.length);
  
      return bytes;
    }
docs: Returns a byte array representing prefix of a queue. The prefix is formed by first byte of
  MD5 of the queue name followed by the queue name.