apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/environment/DefaultPortalMetaServerProvider.java/DefaultPortalMetaServerProvider/reload
class DefaultPortalMetaServerProvider:    @Override
    public void reload() {
        domains = initializeDomains();
        logger.info("Loaded meta server addresses from system property, os environment and properties file: {}", domains);
    }