showuon commented on code in PR #15690:
URL: https://github.com/apache/kafka/pull/15690#discussion_r1587356992


##########
core/src/main/java/kafka/server/TierStateMachine.java:
##########
@@ -54,5 +180,109 @@ PartitionFetchState start(TopicPartition topicPartition,
      * @return the new PartitionFetchState if the tier state machine was 
advanced, otherwise, return the currentFetchState
      */
     Optional<PartitionFetchState> maybeAdvanceState(TopicPartition 
topicPartition,
-                                                    PartitionFetchState 
currentFetchState);
+                                                    PartitionFetchState 
currentFetchState) {
+        // This is currently a no-op but will be used for implementing async 
tiering logic in KAFKA-13560.

Review Comment:
   I think it makes sense we remove this unused placeholder first, and add it 
back when implemented. 



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