AlbumenJ commented on code in PR #12582:
URL: https://github.com/apache/dubbo/pull/12582#discussion_r1264808712


##########
dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/deploy/DefaultModuleDeployer.java:
##########
@@ -428,7 +434,14 @@ private void exportServiceInternal(ServiceConfigBase sc) {
             asyncExportingFutures.add(future);
         } else {
             if (!sc.isExported()) {
-                sc.export(RegisterTypeEnum.AUTO_REGISTER_BY_DEPLOYER);
+                List<URL> registryURLs = 
ConfigValidationUtils.loadRegistries(sc, true);
+                List<String> serviceDiscoveryNames = 
registryURLs.stream().map(url-> 
url.getParameter(RegistryConstants.REGISTRY_CLUSTER_KEY)).distinct().collect(Collectors.toList());

Review Comment:
   If `REGISTRY_CLUSTER` is empty, use `protocol` by default



##########
dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/metadata/ServiceInstanceMetadataUtils.java:
##########
@@ -201,7 +205,24 @@ public static void 
registerMetadataAndInstance(ApplicationModel applicationModel
         LOGGER.info("Start registering instance address to registry.");
         RegistryManager registryManager = 
applicationModel.getBeanFactory().getBean(RegistryManager.class);
         // register service instance
-        
registryManager.getServiceDiscoveries().forEach(ServiceDiscovery::register);
+        List<ServiceDiscovery> serviceDiscoveries = 
registryManager.getServiceDiscoveries();
+        serviceDiscoveries.forEach(ServiceDiscovery::register);
+        if (serviceDiscoveries.size() > 0) {
+            
MetricsEventBus.post(RegistryEvent.toRegisterEvent(applicationModel, 
getServiceDiscoveryNames(serviceDiscoveries)),
+                () -> {
+                    // register service instance
+                    serviceDiscoveries.forEach(ServiceDiscovery::register);
+                    return null;
+                }
+            );
+        }
+    }
+
+    private static List<String> 
getServiceDiscoveryNames(List<ServiceDiscovery> serviceDiscoveries) {
+        return serviceDiscoveries
+            .stream()
+            .map(sd -> 
sd.getUrl().getParameter(RegistryConstants.REGISTRY_CLUSTER_KEY))

Review Comment:
   If `REGISTRY_CLUSTER` is empty, use `protocol` by default



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