static CellComparator createComparator(String comparatorClassName) throws IOException {
    if (
      comparatorClassName
        .equals(InnerStoreCellComparator.INNER_STORE_COMPARATOR.getClass().getName())
    ) {
      return InnerStoreCellComparator.INNER_STORE_COMPARATOR;
    } else
      if (comparatorClassName.equals(MetaCellComparator.META_COMPARATOR.getClass().getName())) {
        return MetaCellComparator.META_COMPARATOR;
      }
    try {
      Class<? extends CellComparator> comparatorClass = getComparatorClass(comparatorClassName);
      if (comparatorClass != null) {
        return comparatorClass.getDeclaredConstructor().newInstance();
      }
      LOG.warn("No Comparator class for " + comparatorClassName + ". Returning Null.");
      return null;
    } catch (Exception e) {
      throw new IOException("Comparator class " + comparatorClassName + " 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