Hangleton commented on code in PR #13240:
URL: https://github.com/apache/kafka/pull/13240#discussion_r1129482786


##########
clients/src/main/java/org/apache/kafka/common/requests/OffsetCommitResponse.java:
##########
@@ -167,8 +213,24 @@ public <P> Builder addPartitions(
         }
 
         public Builder merge(
-            OffsetCommitResponseData newData
+            OffsetCommitResponseData newData,
+            Logger logger
         ) {
+            if (version >= 9) {
+                // This method is called after the group coordinator committed 
the offsets. The group coordinator
+                // provides the OffsetCommitResponseData it built in the 
process. As of now, this data does
+                // not contain topic ids, so we resolve them here.
+                newData.topics().forEach(topic -> {
+                    Uuid topicId = 
topicResolver.getTopicId(topic.name()).orElse(Uuid.ZERO_UUID);
+                    if (Uuid.ZERO_UUID.equals(topicId)) {

Review Comment:
   The server now sends an `UNKNOWN_SERVER_ERROR` when this happens, in the 
code moved to the future handler in `KafkaApis`. Would this behaviour be 
acceptable?



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