@Override
      int putShort(byte[] bytes, int offset, short val) {
        bytes[offset + 1] = (byte) val;
        val >>= 8;
        bytes[offset] = (byte) val;
        return offset + SIZEOF_SHORT;
      }
Returns the Unsafe-using Converter, or falls back to the pure-Java implementation if unable
to do so.
hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java