jolshan commented on code in PR #13901:
URL: https://github.com/apache/kafka/pull/13901#discussion_r1244495117


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -874,4 +1021,34 @@ public void replay(
             consumerGroup.updateMember(newMember);
         }
     }
+
+    /**
+     * A new metadata image is available.
+     *
+     * @param newImage  The new metadata image.
+     * @param delta     The delta image.
+     */
+    public void onNewMetadataImage(MetadataImage newImage, MetadataDelta 
delta) {
+        metadataImage = newImage;
+
+        // Notify all the groups subscribed to the created, updated or

Review Comment:
   Is created topics a different method in topicsDelta? Shouldn't we have 
`createdTopicIds` and we add them? Or is changedTopics accounting for that? Are 
there other changes besides topic creation we can have? 



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