String clusterName = commandLine.getOptionValue('c').trim();
adminExt.start();
Set<String> masterSet = CommandUtil.fetchMasterAddrByClusterName(adminExt, clusterName);
for (String master : masterSet) {
adminExt.deleteSubscriptionGroup(master, groupName);
System.out.printf(
"delete subscription group [%s] from broker [%s] in cluster [%s] success.\n",
groupName, master, clusterName);
}