lucasbru commented on code in PR #15525:
URL: https://github.com/apache/kafka/pull/15525#discussion_r1537350070


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/events/ListOffsetsEvent.java:
##########
@@ -32,8 +32,7 @@
  * {@link OffsetAndTimestamp} found (offset of the first message whose 
timestamp is greater than
  * or equals to the target timestamp)
  */
-public class ListOffsetsEvent extends 
CompletableApplicationEvent<Map<TopicPartition, OffsetAndTimestamp>> {
-
+public class ListOffsetsEvent<T> extends 
CompletableApplicationEvent<Map<TopicPartition, T>> {

Review Comment:
   How about using two separate events `ListOffsets` and 
`ListOffsetsWithTimestamps`? We could save the "requireTimestamps" boolean and 
the use of generics here, which I think would simplify the code. That would 
also get rid of some `unchecked` warnings, that you are currently suppressing, 
I'd expect.



##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
##########
@@ -411,8 +411,8 @@ public int memberEpoch() {
     public void onHeartbeatSuccess(ConsumerGroupHeartbeatResponseData 
response) {
         if (response.errorCode() != Errors.NONE.code()) {
             String errorMessage = String.format(
-                    "Unexpected error in Heartbeat response. Expected no 
error, but received: %s",

Review Comment:
   nit: White space change in a file you aren't otherwise changing, I'd avoid 
it.



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