jsancio commented on code in PR #19416:
URL: https://github.com/apache/kafka/pull/19416#discussion_r2051808958


##########
metadata/src/main/java/org/apache/kafka/controller/FeatureControlManager.java:
##########
@@ -225,6 +272,32 @@ private ApiError updateFeature(
         if (featureName.equals(MetadataVersion.FEATURE_NAME)) {
             // Perform additional checks if we're updating metadata.version
             return updateMetadataVersion(newVersion, 
upgradeType.equals(FeatureUpdate.UpgradeType.UNSAFE_DOWNGRADE), records::add);
+        } else if (featureName.equals(KRaftVersion.FEATURE_NAME)) {
+            if (upgradeType.equals(FeatureUpdate.UpgradeType.UPGRADE)) {
+                try {
+                    kraftVersionAccessor.upgradeKRaftVersion(
+                        currentClaimedEpoch,
+                        KRaftVersion.fromFeatureLevel(newVersion),

Review Comment:
   Fixed. Changed the code to throw `IllegalArgumentException`. This also 
matches what the code in `Feature` does.



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