lishangbu commented on a change in pull request #9807:
URL: https://github.com/apache/dubbo/pull/9807#discussion_r830972113



##########
File path: 
dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/report/MetadataReportInstance.java
##########
@@ -82,7 +81,7 @@ public void init(List<MetadataReportConfig> 
metadataReportConfigs) {
     private void init(MetadataReportConfig config, MetadataReportFactory 
metadataReportFactory) {
         URL url = config.toUrl();
         if (METADATA_REPORT_KEY.equals(url.getProtocol())) {
-            String protocol = url.getParameter(METADATA_REPORT_KEY, 
DEFAULT_DIRECTORY);
+            String protocol = url.getParameter(METADATA_REPORT_KEY, 
config.getProtocol());

Review comment:
        I agree with you,but metadata report center support 
redis/zookeeper/nacos/…….Default value ```dubbo``` will occur a error when 
user‘s configuration is empty.
   so,I think we need to check the config is empty.it throws exception for user 
to remind that they need to config metadata report center protocol correctly.




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