zrlw commented on issue #13675:
URL: https://github.com/apache/dubbo/issues/13675#issuecomment-2561674712
the issue is trigged when both consumer and provider start up at the same
time by these steps:
```
consumer-A (running at NacosRegistry#doSubscribe)
provider-B and nacos registration center
1. get empty instance list of the provider
by namingService.getAllInstances.
3. set the value of forbidden to true
by calling notifySubscriber -> RegistryDirectory#refreshInvoker
4. register instance to
nacos registration center
5. nacos registration center
send instance info
to the subcribers except
consumer-A
as it does not subscribe
yet.
4. subsribe instance info of provider-B later.
but it will receive nothing and 'No provider' RpcException
will be thrown whenever calling provider-B as the value of
forbidden is always true.
```
@laywin
the issue might be fixed by calling notifySubscriber before getAllInstances
like this?
```
// subscribe first to avoid missing event notice?
for (String serviceName : serviceNames) {
subscribeEventListener(serviceName, url, listener);
}
for (String serviceName : serviceNames) {
List<Instance> instances =
namingService.getAllInstances(serviceName,
getUrl().getGroup(Constants.DEFAULT_GROUP));
notifySubscriber(url, serviceName, listener, instances);
}
```
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