@GetMapping("/removeVGroup")
    public Result<?> removeVGroup(@RequestParam String vGroup) {
        Result<?> result = new Result<>();
        boolean rst = vGroupMappingStoreManager.removeVGroup(vGroup);
        Instance.getInstance().setTerm(System.currentTimeMillis());
        if (!rst) {
            result.setCode("500");
            result.setMessage("remove vGroup failed!");
        }
        // push the newest mapping relationship
        vGroupMappingStoreManager.notifyMapping();
        return result;
    }
@Test
    void removeVGroup() {
        namingController.removeVGroup("group1");
    }