cmccabe commented on a change in pull request #10931:
URL: https://github.com/apache/kafka/pull/10931#discussion_r663271148



##########
File path: core/src/main/scala/kafka/server/FinalizedFeatureCache.scala
##########
@@ -127,6 +131,22 @@ class FinalizedFeatureCache(private val brokerFeatures: 
BrokerFeatures) extends
     }
   }
 
+  def update(featuresDelta: FeaturesDelta, highestMetadataOffset: Long): Unit 
= {
+    val features = featuresAndEpoch.getOrElse(
+      FinalizedFeaturesAndEpoch(Features.emptyFinalizedFeatures(), -1))
+    val newFeatures = new util.HashMap[String, FinalizedVersionRange]()
+    newFeatures.putAll(features.features.features())

Review comment:
       Yes, the features code needs a refactor. I guess when we do kraft 
upgrade we'll fix it up.




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