AndrewJSchofield commented on code in PR #18672:
URL: https://github.com/apache/kafka/pull/18672#discussion_r1934133395


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManager.java:
##########
@@ -471,17 +471,18 @@ public CompletableFuture<Map<TopicIdPartition, 
Acknowledgements>> commitSync(
                 // Add the incoming commitSync() request to the queue.
                 Map<TopicIdPartition, Acknowledgements> 
acknowledgementsMapForNode = new HashMap<>();
                 for (TopicIdPartition tip : 
sessionHandler.sessionPartitions()) {
-                    Acknowledgements acknowledgements = 
acknowledgementsMap.get(tip);
-                    if (acknowledgements != null) {
-                        acknowledgementsMapForNode.put(tip, acknowledgements);
+                    NodeAcknowledgements acknowledgements = 
acknowledgementsMap.get(tip);
+                    if ((acknowledgements != null) && 
(acknowledgements.nodeId() == node.id())) {

Review Comment:
   I will rename the variable `acknowledgements` to `nodeAcknowledgements` to 
make it a bit clearer to read. I don't believe that 
`nodeAcknowledgements.acknowledgements()` can be null because the empty case is 
`Acknowledgements.empty()` and the fetching code in the application thread only 
sends the acks to be processed if they are non-empty. I can put a null check in 
the constructor for `NodeAcknowledgements`.



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