private void printUsage() {
    System.err.println("Usage:\n" + "--------------------------\n" + MobRefReporter.class.getName()
      + " output-dir tableName familyName");
    System.err.println(" output-dir       Where to write output report.");
    System.err.println(" tableName        The table name");
    System.err.println(" familyName       The column family name");
  }
Main method for the tool.
@return 0 if success, 1 for bad args. 2 if job aborted with an exception, 3 if mr job was
        unsuccessful
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.java