@Override
  protected void printUsage(final String usageStr, final String usageHeader,
    final String usageFooter) {
    HelpFormatter helpFormatter = new HelpFormatter();
    helpFormatter.setWidth(120);
    helpFormatter.setOptionComparator(new AbstractHBaseTool.OptionsOrderComparator());
    helpFormatter.setLongOptSeparator("=");
    helpFormatter.printHelp(usageStr, usageHeader, options, usageFooter);
  }
Sets filter {@link FilterBase} to the {@link Scan} instance. If provided rowRangeList contains
more than one element, method sets filter which is instance of {@link MultiRowRangeFilter}. If
rowRangeList contains exactly one element, startRow and stopRow are set to the scan. Also,
method may apply {@link FirstKeyOnlyFilter} an {@link KeyOnlyFilter} for better performance.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/RowCounter.java