public BigInteger convertToBigInteger(byte[] row) {
      return (row.length > 0) ? new BigInteger(Bytes.toString(row), radix) : BigInteger.ZERO;
    }
Returns the BigInteger represented by the byte array
@param row byte array representing row
@return the corresponding BigInteger
hbase-server/src/main/java/org/apache/hadoop/hbase/util/RegionSplitter.java