dajac commented on code in PR #13240:
URL: https://github.com/apache/kafka/pull/13240#discussion_r1130942769


##########
clients/src/main/java/org/apache/kafka/common/requests/OffsetCommitResponse.java:
##########
@@ -119,28 +131,52 @@ public boolean shouldClientThrottle(short version) {
         return version >= 4;
     }
 
+    public short version() {
+        return version;
+    }
+
     public static class Builder {
         OffsetCommitResponseData data = new OffsetCommitResponseData();
         HashMap<String, OffsetCommitResponseTopic> byTopicName = new 
HashMap<>();
+        private final TopicResolver topicResolver;
+        private final short version;
+
+        public Builder(TopicResolver topicResolver, short version) {

Review Comment:
   The OffsetCommitValue part is not possible at the moment because we don’t 
have a way to downgrade. My colleague @jeffkbkim works on a proposal for this. 
We could start by either migrating from using TopicPartition to using 
TopicIdPartition or handling this in the GroupCoordinatorAdaptor layer. The 
former is likely simpler.



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