ahuang98 commented on code in PR #16848:
URL: https://github.com/apache/kafka/pull/16848#discussion_r1717231902


##########
metadata/src/main/java/org/apache/kafka/controller/ClusterControlManager.java:
##########
@@ -409,6 +410,15 @@ public ControllerResult<BrokerRegistrationReply> 
registerBroker(
         for (BrokerRegistrationRequestData.Feature feature : 
request.features()) {
             record.features().add(processRegistrationFeature(brokerId, 
finalizedFeatures, feature));
         }
+        if (request.features().find(KRaftVersion.FEATURE_NAME) == null) {

Review Comment:
   I see, iterating over _the controller features_ and checking brokers can 
support them, vs iterating over the broker features.



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