as title 如题

Which Component
spring-cloud-alibaba 2.1.0.RELEASE

Describe the bug

public void initializeMetadata(String serviceName) {
		synchronized (monitor) {
			if (initializedServices.contains(serviceName)) {
				if (logger.isDebugEnabled()) {
					logger.debug(
							"The metadata of Dubbo service[name : {}] has been initialized",
							serviceName);
				}
			}
			else {
				if (logger.isInfoEnabled()) {
					logger.info(
							"The metadata of Dubbo service[name : {}] is about to be initialized",
							serviceName);
				}

				// Keep the order in following invocations
				initSubscribedDubboMetadataService(serviceName);
				initDubboRestServiceMetadataRepository(serviceName);
				// mark this service name having been initialized
				initializedServices.add(serviceName);
			}
		}
	}

	protected void initSubscribedDubboMetadataService(String serviceName) {
		discoveryClient.getInstances(serviceName).stream().findAny()
				.map(this::getDubboMetadataServiceURLs)
				.ifPresent(dubboMetadataServiceURLs -> {
					dubboMetadataServiceURLs.forEach(dubboMetadataServiceURL -> {
						try {
							initSubscribedDubboMetadataServiceURL(
									dubboMetadataServiceURL);
							initDubboMetadataServiceProxy(dubboMetadataServiceURL);
						}
						catch (Throwable e) {
							if (logger.isErrorEnabled()) {
								logger.error(e.getMessage(), e);
							}
						}
					});
				});
	}

The initializedServices.add(serviceName); should be added after successful initialization proxy

Additional context
Java8 、 Version 2.1.0.RELEASE