docs: @SuppressWarnings("unchecked")
          public static void executeCommand(String[] args) throws IOException {
  
              OptionParser parser = getParser();
  
              // declare parameters
              List<String> metaKeys = null;
              String url = null;
  
              // parse command-line input
              args = AdminToolUtils.copyArrayAddFirst(args, "--" + OPT_HEAD_META_CHECK);
              OptionSet options = parser.parse(args);
              if(options.has(AdminParserUtils.OPT_HELP)) {
                  printHelp(System.out);
                  return;
              }
  
              // check required options and/or conflicting options
              AdminParserUtils.checkRequired(options, OPT_HEAD_META_CHECK);
              AdminParserUtils.checkRequired(options, AdminParserUtils.OPT_URL);
  
              // load parameters
              metaKeys = (List<String>) options.valuesOf(OPT_HEAD_META_CHECK);
              url = (String) options.valueOf(AdminParserUtils.OPT_URL);
  
  
              // execute command
              if(metaKeys.size() == 0
                 || (metaKeys.size() == 1 && metaKeys.get(0).equals(METAKEY_ALL))) {
                  metaKeys = Lists.newArrayList();
                  metaKeys.add(MetadataStore.CLUSTER_KEY);
                  metaKeys.add(MetadataStore.STORES_KEY);
                  metaKeys.add(MetadataStore.SERVER_STATE_KEY);
              }
  
              AdminClient adminClient = AdminToolUtils.getAdminClient(url);
  
              doMetaCheck(adminClient, metaKeys);
          }