code: private byte[] getRowKey(long writePointer, int count) {
      byte[] row = Arrays.copyOf(queueRowPrefix, queueRowPrefix.length + Longs.BYTES + Ints.BYTES);
      Bytes.putLong(row, queueRowPrefix.length, writePointer);
      Bytes.putInt(row, queueRowPrefix.length + Longs.BYTES, count);
      return row;
    }
docs: Creates a new byte[] that gives the entry row key for the given enqueue transaction and counter.