showuon commented on code in PR #12748:
URL: https://github.com/apache/kafka/pull/12748#discussion_r1032023101


##########
clients/src/test/java/org/apache/kafka/clients/consumer/CooperativeStickyAssignorTest.java:
##########
@@ -44,14 +46,26 @@ public AbstractStickyAssignor createAssignor() {
     }
 
     @Override
-    public Subscription buildSubscription(List<String> topics, 
List<TopicPartition> partitions) {
-        return new Subscription(topics, assignor.subscriptionUserData(new 
HashSet<>(topics)), partitions);
+    public Subscription buildSubscriptionV0(List<String> topics, 
List<TopicPartition> partitions, int generationId) {
+        // cooperative sticky assignor only supports 
ConsumerProtocolSubscription V1 or above
+        return null;

Review Comment:
   Thanks David, but in `testMemberDataFromSubscription` test, I did use `null` 
check to make sure we will skip ConsumerProtocolSubscription v0 in 
cooperativeStickyAssignor. We can throw exception here, but that would make the 
test more complicated and that's unnecessary IMO. 



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