jolshan commented on code in PR #16183:
URL: https://github.com/apache/kafka/pull/16183#discussion_r1684712684


##########
core/src/main/scala/kafka/server/BrokerLifecycleManager.scala:
##########
@@ -381,10 +381,12 @@ class BrokerLifecycleManager(
   private def sendBrokerRegistration(): Unit = {
     val features = new BrokerRegistrationRequestData.FeatureCollection()
     _supportedFeatures.asScala.foreach {
-      case (name, range) => features.add(new 
BrokerRegistrationRequestData.Feature().
+      // Do not include features with the range 0-0.
+      case (name, range) if range.max() > 0 => features.add(new 
BrokerRegistrationRequestData.Feature().

Review Comment:
   My proposal was that in defaultSupportedFeatues, we iterate over the 
features and add them to a map. Instead of just adding them all, we check if 
the range is 0-0. If so, we don't add them. (No removal needed) Thus, we don't 
need specific logic in the apis to remove the feature later. 
   
   The only concern is if somehow the features map expected a feature to exist. 
Not sure I follow mutating if the config is on or off. I assume we can't change 
the config to enable unstable features dynamically. (If we did, we'd have to 
mutate the map anyway)



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