showuon commented on code in PR #12748:
URL: https://github.com/apache/kafka/pull/12748#discussion_r1018908171


##########
clients/src/test/java/org/apache/kafka/clients/consumer/CooperativeStickyAssignorTest.java:
##########
@@ -78,6 +80,26 @@ public void testDecodeGeneration() {
         assertFalse(((CooperativeStickyAssignor) 
assignor).memberData(subscription).generation.isPresent());
     }
 
+    @Test
+    public void 
testCooperativeStickyAssignorHonorSubscriptionUserdataIfNoGenerationIdInField() 
{
+        Map<String, Integer> partitionsPerTopic = new HashMap<>();
+        partitionsPerTopic.put(topic, 2);
+        int higherGenerationId = 2;
+        int lowerGenerationId = 1;
+
+        assignor.onAssignment(new 
ConsumerPartitionAssignor.Assignment(partitions(tp1)), new 
ConsumerGroupMetadata(groupId, higherGenerationId, consumer1, 
Optional.empty()));
+        ByteBuffer userDataWithHigherGenerationId = 
assignor.subscriptionUserData(new HashSet<>(topics(topic)));

Review Comment:
   You're right. Change to test `memberDataFromSubscription`



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