I re-examine the code, and I apologize for my mis-interpretation for
```java
if (invokerUrls.isEmpty() && this.cachedInvokerUrls != null) {
invokerUrls.addAll(this.cachedInvokerUrls);
} else {
this.cachedInvokerUrls = new HashSet<URL>();
this.cachedInvokerUrls.addAll(invokerUrls);//Cached invoker
urls, convenient for comparison
}
if (invokerUrls.isEmpty()) {
return;
}
```
Dubbo doesn't have protection mechanism when empty set of addresses is pushed.
We should consider it.
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/1508 ]
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