kowshik commented on a change in pull request #9001:
URL: https://github.com/apache/kafka/pull/9001#discussion_r468109791



##########
File path: core/src/main/scala/kafka/controller/KafkaController.scala
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@@ -1647,6 +1865,192 @@ class KafkaController(val config: KafkaConfig,
     }
   }
 
+  /**
+   * Returns the new FinalizedVersionRange for the feature, if there are no 
feature
+   * incompatibilities seen with all known brokers for the provided feature 
update.
+   * Otherwise returns an ApiError object containing Errors#INVALID_REQUEST.
+   *
+   * @param update   the feature update to be processed (this can not be meant 
to delete the feature)
+   *
+   * @return         the new FinalizedVersionRange or error, as described 
above.
+   */
+  private def newFinalizedVersionRangeOrIncompatibilityError(update: 
UpdateFeaturesRequestData.FeatureUpdateKey): Either[FinalizedVersionRange, 
ApiError] = {
+    if (UpdateFeaturesRequest.isDeleteRequest(update)) {
+      throw new IllegalArgumentException(s"Provided feature update can not be 
meant to delete the feature: $update")
+    }
+
+    val incompatibilityError = "Could not apply finalized feature update 
because" +
+      " brokers were found to have incompatible versions for the feature."
+
+    if (brokerFeatures.supportedFeatures.get(update.feature()) == null) {

Review comment:
       It's required because `defaultMinVersionLevel` does not exist for a 
feature that's not in the supported list. However, I'll change the code to make 
the check more obvious to the reader (currently it's not).




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