code: protected void recoverRegistryData() {
  
          for (ProviderConfig providerConfig : providerUrls.keySet()) {
              registerProviderUrls(providerConfig);
          }
  
          for (ConsumerConfig consumerConfig : consumerUrls.keySet()) {
              subscribeConsumerUrls(consumerConfig);
          }
  
      }
docs: recover data when connect with zk again.