dajac commented on code in PR #14557:
URL: https://github.com/apache/kafka/pull/14557#discussion_r1426733887


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/CommitRequestManager.java:
##########
@@ -381,23 +441,37 @@ public NetworkClientDelegate.UnsentRequest 
toUnsentRequest() {
                 requestTopicDataMap.put(topicPartition.topic(), topic);
             }
 
-            OffsetCommitRequest.Builder builder = new 
OffsetCommitRequest.Builder(
-                new OffsetCommitRequestData()
+            OffsetCommitRequestData data = new OffsetCommitRequestData()
                     .setGroupId(this.groupId)
-                    .setGenerationIdOrMemberEpoch(generation.generationId)
-                    .setMemberId(generation.memberId)
-                    .setGroupInstanceId(groupInstanceId)
-                    .setTopics(new ArrayList<>(requestTopicDataMap.values())));
+                    .setGroupInstanceId(groupInstanceId.orElse(null))
+                    .setTopics(new ArrayList<>(requestTopicDataMap.values()));
+            if (memberInfo.memberId.isPresent()) {
+                data = data.setMemberId(memberInfo.memberId.get());
+            }
+            if (memberInfo.memberEpoch.isPresent()) {
+                data = 
data.setGenerationIdOrMemberEpoch(memberInfo.memberEpoch.get());
+            }
+
+            OffsetCommitRequest.Builder builder = new 
OffsetCommitRequest.Builder(data);
+
             NetworkClientDelegate.UnsentRequest resp = new 
NetworkClientDelegate.UnsentRequest(
                 builder,
                 coordinatorRequestManager.coordinator());
             resp.whenComplete(
                 (response, throwable) -> {
                     try {
                         if (throwable == null) {
+                            log.debug("OffsetCommit response received for 
offsets {} ", offsets);
                             onResponse(response);
                         } else {
-                            onError(throwable, 
resp.handler().completionTimeMs());
+                            log.debug("OffsetCommit completed with error for 
offsets {}", offsets, throwable);
+                            long currentTimeMs = 
resp.handler().completionTimeMs();
+                            handleCoordinatorDisconnect(throwable, 
currentTimeMs);
+                            if (throwable instanceof RetriableException) {
+                                retry(currentTimeMs, throwable);
+                            } else {
+                                future.completeExceptionally(throwable);
+                            }

Review Comment:
   I wonder if we could have something like:
   
   ```
   if (notRetriable(throwable) || !maybeRetry(currentTimeMs, throwable)) {
       future.completeExceptionally(throwable);
   }
   ```
   
   Thinking about this because `retry` may not retry if the timer is expired. 



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