@Override
    protected void printUsage() {
      System.out.println(DELETE_CMD_USAGE);
      Options options = new Options();
      options.addOption(OPTION_KEEP, true, OPTION_KEEP_DESC);
      options.addOption(OPTION_LIST, true, OPTION_BACKUP_LIST_DESC);

      HelpFormatter helpFormatter = new HelpFormatter();
      helpFormatter.setLeftPadding(2);
      helpFormatter.setDescPadding(8);
      helpFormatter.setWidth(100);
      helpFormatter.setSyntaxPrefix("Options:");
      helpFormatter.printHelp(" ", null, options, USAGE_FOOTER);

    }
Command requires consistent state of a backup system Backup system may become inconsistent
because of an abnormal termination of a backup session or delete command
@return true, if yes
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupCommands.java