AlbumenJ commented on issue #9965:
URL: https://github.com/apache/dubbo/issues/9965#issuecomment-1107986744
如果注册中心存在空地址的情况会走到下面的逻辑进行销毁
```
private void refreshInvoker(List<URL> invokerUrls) {
Assert.notNull(invokerUrls, "invokerUrls should not be null, use
EMPTY url to clear current addresses.");
this.originalUrls = invokerUrls;
if (invokerUrls.size() == 1 &&
EMPTY_PROTOCOL.equals(invokerUrls.get(0).getProtocol())) {
logger.warn("Received url with EMPTY protocol, will clear all
available addresses.");
this.forbidden = true; // Forbid to access
routerChain.setInvokers(BitList.emptyList());
destroyAllInvokers(); // Close all invokers
}
}
```
即使转订阅为空也会走这里快速返回，不会 destroy
```
if (CollectionUtils.isEmptyMap(newUrlInvokerMap)) {
logger.error(new IllegalStateException("Cannot create
invokers from url address list (total " + invokerUrls.size() + ")"));
return;
}
```
这个应该是触发了注册中心空地址保护的逻辑了，在注册中心地址为空的时候拿前一次非空的结果进行处理，避免由于注册中心不可用造成的抖动，可以通过以下配置关闭
```
RegistryConfig.java
@Parameter(key = ENABLE_EMPTY_PROTECTION_KEY)
public Boolean getEnableEmptyProtection() {
return enableEmptyProtection;
}
public void setEnableEmptyProtection(Boolean enableEmptyProtection) {
this.enableEmptyProtection = enableEmptyProtection;
}
```
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