public void setComparatorClass(Class<? extends CellComparator> klass) {
    // Is the comparator instantiable?
    try {
      // If null, it should be the Bytes.BYTES_RAWCOMPARATOR
      if (klass != null) {
        CellComparator comp = klass.getDeclaredConstructor().newInstance();
        // if the name wasn't one of the legacy names, maybe its a legit new
        // kind of comparator.
        this.comparatorClassName = klass.getName();
      }
    } catch (Exception e) {
      throw new RuntimeException("Comparator class " + klass.getName() + " is not instantiable", e);
    }
  }
Returns the minor version of this HFile format
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java