ShivsundarR commented on code in PR #18944:
URL: https://github.com/apache/kafka/pull/18944#discussion_r1960241628


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManager.java:
##########
@@ -177,8 +177,14 @@ public PollResult poll(long currentTimeMs) {
                 if (nodeAcksFromFetchMap != null) {
                     acknowledgementsToSend = nodeAcksFromFetchMap.remove(tip);
                     if (acknowledgementsToSend != null) {
-                        
metricsManager.recordAcknowledgementSent(acknowledgementsToSend.size());
-                        
fetchAcknowledgementsInFlight.computeIfAbsent(node.id(), k -> new 
HashMap<>()).put(tip, acknowledgementsToSend);
+                        if (handler.isNewSession()) {
+                            // Failing the acknowledgements as we cannot have 
piggybacked acknowledgements in the initial ShareFetchRequest.
+                            
acknowledgementsToSend.complete(Errors.INVALID_SHARE_SESSION_EPOCH.exception());
+                            
maybeSendShareAcknowledgeCommitCallbackEvent(Collections.singletonMap(tip, 
acknowledgementsToSend));

Review Comment:
   Okay, thanks. I have updated all the occurences of 
`Collections.singletonMap` to `Map.of` in the file. 



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