code: protected void doUnRegister(String serviceName, ProviderInfo providerInfo) {
          //{service : [provider...]}
          ProviderGroup oldGroup = memoryCache.get(serviceName);
          if (oldGroup != null) { // 存在老的key
              oldGroup.remove(providerInfo);
          } else {
              return;
          }
          // 备份到文件 改为定时写
          needBackup = true;
          doWriteFile();
  
          if (subscribe) {
              notifyConsumerListeners(serviceName, memoryCache.get(serviceName));
          }
      }
docs: 反注册服务信息
  
  @param serviceName  服务关键字
  @param providerInfo 服务提供者数据