code: @Deprecated
    public static int findNthByte(byte [] utf, int start, int length, byte b, int n) {
      return org.apache.hadoop.util.UTF8ByteArrayUtils.findNthByte(utf, start,
          length, b, n);
    }
docs: Find the nth occurrence of the given byte b in a UTF-8 encoded string
  @param utf a byte array containing a UTF-8 encoded string
  @param start starting offset
  @param length the length of byte array
  @param b the byte to find
  @param n the desired occurrence of the given byte
  @return position that nth occurrence of the given byte if exists; otherwise -1
  @deprecated use
  {@link org.apache.hadoop.util.UTF8ByteArrayUtils#findNthByte(byte[], int,
  int, byte, int)}