frankvicky commented on code in PR #17549:
URL: https://github.com/apache/kafka/pull/17549#discussion_r1807326273


##########
core/src/test/scala/unit/kafka/server/GroupCoordinatorBaseRequestTest.scala:
##########
@@ -569,7 +569,7 @@ class GroupCoordinatorBaseRequestTest(cluster: 
ClusterInstance) {
 
   protected def consumerGroupHeartbeat(
     groupId: String,
-    memberId: String = "",
+    memberId: String = Uuid.randomUuid().toString,

Review Comment:
   Since we are upgrading the `ConsumerGroupHeartbeat`, the `memberId` cannot 
be empty or null.
   It would be nice to test the older version of the protocol, but I'm not 
quite sure how to achieve that.
   



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