leimbag commented on issue #9623:
URL: https://github.com/apache/dubbo/issues/9623#issuecomment-1021050623
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？
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