chickenlj commented on issue #9623:
URL: https://github.com/apache/dubbo/issues/9623#issuecomment-1043860035
> 大致过程是
provider优雅下线后，consumer在接收到下线事件后，会在类org.apache.dubbo.registry.client.ServiceDiscoveryRegistryDirectory的refreshInvoker方法直接返回
>
> ```
> this.forbidden = false; // Allow accessing
> if (CollectionUtils.isEmpty(invokerUrls)) {
> logger.warn("Received empty url list, will ignore for
protection purpose.");
> return;
> }
> ```
>
> 后续就开始无限循环HeaderExchangeClient了，直到provider重新发布启动
>
> 这里的保护是为了保护什么情况？
默认会触发空地址推送保护，目的是为了防止生产环境误下线机器导致服务不可用。
开发环境，可通过配置关闭推空保护，即使不关闭也不影响最终测试效果，只是从空地址异常变为链接异常。
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