if instance.Endpoint.Address != "" {
			s.ip2instance[instance.Endpoint.Address] = append(s.ip2instance[instance.Endpoint.Address], instance)
		}
	}
}

func (s *serviceInstancesStore) updateInstances(key configKeyWithParent, instances []*model.ServiceInstance) {
	// first delete
	s.deleteInstanceKeys(key, instances)

	// second add
	s.addInstances(key, instances)
}