squah-confluent commented on code in PR #24023:
URL: https://github.com/apache/kafka/pull/24023#discussion_r4457983950


##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/GroupMetadataManagerTest.java:
##########
@@ -1533,6 +1533,125 @@ public void 
testUpdatingSubscriptionTriggersNewTargetAssignment() {
         assertRecordsEquals(expectedRecords, result.records());
     }
 
+    @Test
+    public void testUpdatingRackIdTriggersEpochBump() {
+        String groupId = "fooup";
+        String memberId = Uuid.randomUuid().toString();
+        Uuid fooTopicId = Uuid.randomUuid();
+        String fooTopicName = "foo";
+
+        CoordinatorMetadataImage metadataImage = new MetadataImageBuilder()
+            .addTopic(fooTopicId, fooTopicName, 1)
+            .addRacks()
+            .buildCoordinatorMetadataImage();
+
+        MockPartitionAssignor assignor = new MockPartitionAssignor("range");
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            
.withConfig(GroupCoordinatorConfig.CONSUMER_GROUP_ASSIGNORS_CONFIG, 
List.of(assignor))
+            .withMetadataImage(metadataImage)
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withMember(new ConsumerGroupMember.Builder(memberId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(9)
+                    .setClientId(DEFAULT_CLIENT_ID)
+                    .setClientHost(DEFAULT_CLIENT_ADDRESS.toString())
+                    .setRackId("rack-a")
+                    .setSubscribedTopicNames(List.of(fooTopicName))
+                    .setServerAssignorName("range")
+                    .setAssignedPartitions(toAssignmentWithEpochs(mkAssignment(
+                        mkTopicAssignment(fooTopicId, 0)), 10))
+                    .build())
+                .withAssignment(memberId, 
mkAssignment(mkTopicAssignment(fooTopicId, 0)))
+                .withAssignmentEpoch(10)
+                .withMetadataHash(computeGroupHash(Map.of(
+                    fooTopicName, computeTopicHash(fooTopicName, 
metadataImage)))))
+            .build();
+
+        assignor.prepareGroupAssignment(new GroupAssignment(
+            Map.of(memberId, new 
MemberAssignmentImpl(mkAssignment(mkTopicAssignment(fooTopicId, 0))))
+        ));
+
+        CoordinatorResult<ConsumerGroupHeartbeatResponseData, 
CoordinatorRecord> result = context.consumerGroupHeartbeat(
+            new ConsumerGroupHeartbeatRequestData()
+                .setGroupId(groupId)
+                .setMemberId(memberId)
+                .setMemberEpoch(10)
+                .setRackId("rack-b"));
+
+        assertResponseEquals(
+            new ConsumerGroupHeartbeatResponseData()
+                .setMemberId(memberId)
+                .setMemberEpoch(11)
+                .setHeartbeatIntervalMs(5000),
+            result.response()
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("testSameRackIdKeepGroupEpochSource")

Review Comment:
   Perhaps we can move the cases inline using `@CsvSource` with `nullValues=`?



##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/GroupMetadataManagerTest.java:
##########
@@ -1533,6 +1533,125 @@ public void 
testUpdatingSubscriptionTriggersNewTargetAssignment() {
         assertRecordsEquals(expectedRecords, result.records());
     }
 
+    @Test
+    public void testUpdatingRackIdTriggersEpochBump() {
+        String groupId = "fooup";
+        String memberId = Uuid.randomUuid().toString();
+        Uuid fooTopicId = Uuid.randomUuid();
+        String fooTopicName = "foo";
+
+        CoordinatorMetadataImage metadataImage = new MetadataImageBuilder()
+            .addTopic(fooTopicId, fooTopicName, 1)
+            .addRacks()
+            .buildCoordinatorMetadataImage();
+
+        MockPartitionAssignor assignor = new MockPartitionAssignor("range");
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            
.withConfig(GroupCoordinatorConfig.CONSUMER_GROUP_ASSIGNORS_CONFIG, 
List.of(assignor))
+            .withMetadataImage(metadataImage)
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withMember(new ConsumerGroupMember.Builder(memberId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(9)
+                    .setClientId(DEFAULT_CLIENT_ID)
+                    .setClientHost(DEFAULT_CLIENT_ADDRESS.toString())
+                    .setRackId("rack-a")
+                    .setSubscribedTopicNames(List.of(fooTopicName))
+                    .setServerAssignorName("range")
+                    .setAssignedPartitions(toAssignmentWithEpochs(mkAssignment(
+                        mkTopicAssignment(fooTopicId, 0)), 10))
+                    .build())
+                .withAssignment(memberId, 
mkAssignment(mkTopicAssignment(fooTopicId, 0)))
+                .withAssignmentEpoch(10)
+                .withMetadataHash(computeGroupHash(Map.of(
+                    fooTopicName, computeTopicHash(fooTopicName, 
metadataImage)))))
+            .build();
+
+        assignor.prepareGroupAssignment(new GroupAssignment(
+            Map.of(memberId, new 
MemberAssignmentImpl(mkAssignment(mkTopicAssignment(fooTopicId, 0))))
+        ));
+
+        CoordinatorResult<ConsumerGroupHeartbeatResponseData, 
CoordinatorRecord> result = context.consumerGroupHeartbeat(
+            new ConsumerGroupHeartbeatRequestData()
+                .setGroupId(groupId)
+                .setMemberId(memberId)
+                .setMemberEpoch(10)
+                .setRackId("rack-b"));
+
+        assertResponseEquals(
+            new ConsumerGroupHeartbeatResponseData()
+                .setMemberId(memberId)
+                .setMemberEpoch(11)
+                .setHeartbeatIntervalMs(5000),
+            result.response()
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("testSameRackIdKeepGroupEpochSource")
+    public void testSameRackIdKeepGroupEpochSource(String oldRackId, String 
newRackId) {

Review Comment:
   How about `testSameRackIdDoesNotTriggerEpochBump`?
   Trying to keep the names similar



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