dongnuo123 commented on code in PR #15798:
URL: https://github.com/apache/kafka/pull/15798#discussion_r1583691897


##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/GroupMetadataManagerTest.java:
##########
@@ -10921,6 +10855,544 @@ public void 
testLastConsumerProtocolMemberRebalanceTimeoutInConsumerGroup() {
         assertTrue(classicGroup.isInState(PREPARING_REBALANCE));
     }
 
+    @Test
+    public void testConsumerGroupJoinThrowsExceptionIfGroupOverMaxSize() {
+        String groupId = "group-id";
+        String memberId = Uuid.randomUuid().toString();
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withMember(new ConsumerGroupMember.Builder(memberId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(10)
+                    .build()))
+            .withConsumerGroupMaxSize(1)
+            .build();
+
+        JoinGroupRequestData request = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withDefaultProtocolTypeAndProtocols()
+            .build();
+
+        Exception ex = assertThrows(GroupMaxSizeReachedException.class, () -> 
context.sendClassicGroupJoin(request));
+        assertEquals("The consumer group has reached its maximum capacity of 1 
members.", ex.getMessage());
+    }
+
+    @Test
+    public void testConsumerGroupJoinInvalidSessionTimeout() throws Exception {
+        int minSessionTimeout = 50;
+        int maxSessionTimeout = 100;
+        String groupId = "group-id";
+
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withClassicGroupMinSessionTimeoutMs(minSessionTimeout)
+            .withClassicGroupMaxSessionTimeoutMs(maxSessionTimeout)
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10))
+            .build();
+
+        JoinGroupRequestData requestWithSmallSessionTimeout = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withSessionTimeoutMs(minSessionTimeout - 1)
+            .build();
+        assertThrows(InvalidSessionTimeoutException.class, () -> 
context.sendClassicGroupJoin(requestWithSmallSessionTimeout));
+
+        JoinGroupRequestData requestWithLargeSessionTimeout = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withSessionTimeoutMs(maxSessionTimeout + 1)
+            .build();
+        assertThrows(InvalidSessionTimeoutException.class, () -> 
context.sendClassicGroupJoin(requestWithLargeSessionTimeout));
+    }
+
+    @Test
+    public void testConsumerGroupJoinThrowsExceptionIfProtocolIsNotSupported() 
{
+        String groupId = "group-id";
+        String memberId = Uuid.randomUuid().toString();
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withMember(new ConsumerGroupMember.Builder(memberId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(10)
+                    
.setSupportedClassicProtocols(GroupMetadataManagerTestContext.toProtocols("roundrobin"))
+                    .build()))
+            .build();
+
+        JoinGroupRequestData requestWithEmptyProtocols = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withProtocolType(ConsumerProtocol.PROTOCOL_TYPE)
+            .withDefaultProtocolTypeAndProtocols()
+            .build();
+        assertThrows(InconsistentGroupProtocolException.class, () -> 
context.sendClassicGroupJoin(requestWithEmptyProtocols));
+
+        JoinGroupRequestData requestWithInvalidProtocolType = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withProtocolType("connect")
+            .withDefaultProtocolTypeAndProtocols()
+            .build();
+        assertThrows(InconsistentGroupProtocolException.class, () -> 
context.sendClassicGroupJoin(requestWithInvalidProtocolType));
+    }
+
+    @Test
+    public void testConsumerGroupJoinWithNewDynamicMember() throws Exception {
+        String groupId = "group-id";
+        String memberId = Uuid.randomUuid().toString();
+        Uuid fooTopicId = Uuid.randomUuid();
+        String fooTopicName = "foo";
+        Uuid barTopicId = Uuid.randomUuid();
+        String barTopicName = "bar";
+
+        MockPartitionAssignor assignor = new MockPartitionAssignor("range");
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withAssignors(Collections.singletonList(assignor))
+            .withMetadataImage(new MetadataImageBuilder()
+                .addTopic(fooTopicId, fooTopicName, 2)
+                .addTopic(barTopicId, barTopicName, 1)
+                .addRacks()
+                .build())
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withSubscriptionMetadata(new HashMap<String, TopicMetadata>() 
{
+                    {
+                        put(fooTopicName, new TopicMetadata(fooTopicId, 
fooTopicName, 2, mkMapOfPartitionRacks(2)));
+                    }
+                })
+                .withMember(new ConsumerGroupMember.Builder(memberId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(10)
+                    .build())
+                .withAssignment(memberId, mkAssignment(
+                    mkTopicAssignment(fooTopicId, 0, 1)))
+                .withAssignmentEpoch(10))
+            .build();
+
+        JoinGroupRequestData request = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withProtocols(GroupMetadataManagerTestContext.toRangeProtocol(
+                Arrays.asList(fooTopicName, barTopicName),
+                Collections.emptyList()))
+            .build();
+        assertThrows(MemberIdRequiredException.class, () -> 
context.sendClassicGroupJoin(request, true));
+
+        // Simulate getting the new member id from the error response.
+        String newMemberId = Uuid.randomUuid().toString();
+
+        assignor.prepareGroupAssignment(new GroupAssignment(
+            new HashMap<String, MemberAssignment>() {
+                {
+                    put(memberId, new MemberAssignment(mkAssignment(
+                        mkTopicAssignment(fooTopicId, 0)
+                    )));
+                    put(newMemberId, new MemberAssignment(mkAssignment(
+                        mkTopicAssignment(barTopicId, 0)
+                    )));
+                }
+            }
+        ));
+
+        JoinGroupRequestData secondRequest = new JoinGroupRequestData()
+            .setGroupId(request.groupId())
+            .setMemberId(newMemberId)
+            .setProtocolType(request.protocolType())
+            .setProtocols(request.protocols())
+            .setSessionTimeoutMs(request.sessionTimeoutMs())
+            .setRebalanceTimeoutMs(request.rebalanceTimeoutMs())
+            .setReason(request.reason());
+
+        GroupMetadataManagerTestContext.JoinResult secondJoinResult = 
context.sendClassicGroupJoin(
+            secondRequest,
+            true
+        );
+
+        ConsumerGroupMember expectedMember = new 
ConsumerGroupMember.Builder(newMemberId)
+            .setMemberEpoch(11)
+            .setPreviousMemberEpoch(0)
+            .setState(MemberState.STABLE)
+            .setClientId("client")
+            .setClientHost("localhost/127.0.0.1")
+            .setSubscribedTopicNames(Arrays.asList(fooTopicName, barTopicName))
+            .setRebalanceTimeoutMs(500)
+            .setAssignedPartitions(assignor.targetPartitions(newMemberId))
+            .setSupportedClassicProtocols(request.protocols())
+            .build();
+
+        List<Record> expectedRecords = Arrays.asList(
+            RecordHelpers.newMemberSubscriptionRecord(groupId, expectedMember),
+            RecordHelpers.newGroupSubscriptionMetadataRecord(groupId, new 
HashMap<String, TopicMetadata>() {
+                {
+                    put(fooTopicName, new TopicMetadata(fooTopicId, 
fooTopicName, 2, mkMapOfPartitionRacks(2)));
+                    put(barTopicName, new TopicMetadata(barTopicId, 
barTopicName, 1, mkMapOfPartitionRacks(1)));
+                }
+            }),
+            RecordHelpers.newGroupEpochRecord(groupId, 11),
+
+            RecordHelpers.newTargetAssignmentRecord(groupId, memberId, 
assignor.targetPartitions(memberId)),
+            RecordHelpers.newTargetAssignmentRecord(groupId, newMemberId, 
assignor.targetPartitions(newMemberId)),
+
+            RecordHelpers.newTargetAssignmentEpochRecord(groupId, 11),
+            RecordHelpers.newCurrentAssignmentRecord(groupId, expectedMember)
+        );
+        assertRecordsEquals(expectedRecords.subList(0, 3), 
secondJoinResult.records.subList(0, 3));
+        assertUnorderedListEquals(expectedRecords.subList(3, 5), 
secondJoinResult.records.subList(3, 5));
+        assertRecordsEquals(expectedRecords.subList(5, 7), 
secondJoinResult.records.subList(5, 7));
+
+        assertTrue(secondJoinResult.joinFuture.isDone());
+        assertEquals(
+            new JoinGroupResponseData()
+                .setMemberId(newMemberId)
+                .setGenerationId(11)
+                .setProtocolType(ConsumerProtocol.PROTOCOL_TYPE)
+                .setProtocolName("range"),
+            secondJoinResult.joinFuture.get()
+        );
+
+        context.assertSessionTimeout(groupId, newMemberId, 45000);
+        context.assertSyncTimeout(groupId, newMemberId, 
request.rebalanceTimeoutMs());
+    }
+
+    @Test
+    public void testConsumerGroupJoinWithNewStaticMember() throws Exception {
+        String groupId = "group-id";
+        String memberId = Uuid.randomUuid().toString();
+        String instanceId = "instance-id";
+        Uuid fooTopicId = Uuid.randomUuid();
+        String fooTopicName = "foo";
+        Uuid barTopicId = Uuid.randomUuid();
+        String barTopicName = "bar";
+
+        MockPartitionAssignor assignor = new MockPartitionAssignor("range");
+        assignor.prepareGroupAssignment(new 
GroupAssignment(Collections.emptyMap()));
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withAssignors(Collections.singletonList(assignor))
+            .withMetadataImage(new MetadataImageBuilder()
+                .addTopic(fooTopicId, fooTopicName, 2)
+                .addTopic(barTopicId, barTopicName, 1)
+                .addRacks()
+                .build())
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withSubscriptionMetadata(new HashMap<String, TopicMetadata>() 
{
+                    {
+                        put(fooTopicName, new TopicMetadata(fooTopicId, 
fooTopicName, 2, mkMapOfPartitionRacks(2)));
+                    }
+                })
+                .withMember(new ConsumerGroupMember.Builder(memberId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(10)
+                    .build())
+                .withAssignment(memberId, mkAssignment(
+                    mkTopicAssignment(fooTopicId, 0, 1)))
+                .withAssignmentEpoch(10))
+            .build();
+
+        JoinGroupRequestData request = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withGroupInstanceId(instanceId)
+            .withProtocols(GroupMetadataManagerTestContext.toRangeProtocol(
+                Arrays.asList(fooTopicName, barTopicName),
+                Collections.emptyList()))
+            .build();
+
+        GroupMetadataManagerTestContext.JoinResult joinResult = 
context.sendClassicGroupJoin(request);
+        String newMemberId = joinResult.joinFuture.get().memberId();
+
+        ConsumerGroupMember expectedMember = new 
ConsumerGroupMember.Builder(newMemberId)
+            .setMemberEpoch(11)
+            .setPreviousMemberEpoch(0)
+            .setInstanceId(instanceId)
+            .setState(MemberState.STABLE)
+            .setClientId("client")
+            .setClientHost("localhost/127.0.0.1")
+            .setSubscribedTopicNames(Arrays.asList(fooTopicName, barTopicName))
+            .setRebalanceTimeoutMs(500)
+            .setSupportedClassicProtocols(request.protocols())
+            .build();
+
+        List<Record> expectedRecords = Arrays.asList(
+            RecordHelpers.newMemberSubscriptionRecord(groupId, expectedMember),
+            RecordHelpers.newGroupSubscriptionMetadataRecord(groupId, new 
HashMap<String, TopicMetadata>() {
+                {
+                    put(fooTopicName, new TopicMetadata(fooTopicId, 
fooTopicName, 2, mkMapOfPartitionRacks(2)));
+                    put(barTopicName, new TopicMetadata(barTopicId, 
barTopicName, 1, mkMapOfPartitionRacks(1)));
+                }
+            }),
+            RecordHelpers.newGroupEpochRecord(groupId, 11),
+
+            RecordHelpers.newTargetAssignmentRecord(groupId, memberId, 
Collections.emptyMap()),
+            RecordHelpers.newTargetAssignmentRecord(groupId, newMemberId, 
Collections.emptyMap()),
+
+            RecordHelpers.newTargetAssignmentEpochRecord(groupId, 11),
+            RecordHelpers.newCurrentAssignmentRecord(groupId, expectedMember)
+        );
+        assertRecordsEquals(expectedRecords.subList(0, 3), 
joinResult.records.subList(0, 3));
+        assertUnorderedListEquals(expectedRecords.subList(3, 5), 
joinResult.records.subList(3, 5));
+        assertRecordsEquals(expectedRecords.subList(5, 7), 
joinResult.records.subList(5, 7));
+
+        assertTrue(joinResult.joinFuture.isDone());
+        assertEquals(
+            new JoinGroupResponseData()
+                .setMemberId(newMemberId)
+                .setGenerationId(11)
+                .setProtocolType(ConsumerProtocol.PROTOCOL_TYPE)
+                .setProtocolName("range"),
+            joinResult.joinFuture.get()
+        );
+
+        context.assertSessionTimeout(groupId, newMemberId, 45000);
+        context.assertSyncTimeout(groupId, newMemberId, 
request.rebalanceTimeoutMs());
+    }
+
+    @Test
+    public void testConsumerGroupJoinReplacingExistingStaticMember() throws 
Exception {
+        String groupId = "group-id";
+        String memberId = Uuid.randomUuid().toString();
+        String instanceId = "instance-id";
+        Uuid fooTopicId = Uuid.randomUuid();
+        String fooTopicName = "foo";
+
+        MockPartitionAssignor assignor = new MockPartitionAssignor("range");
+        assignor.prepareGroupAssignment(new 
GroupAssignment(Collections.emptyMap()));
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withAssignors(Collections.singletonList(assignor))
+            .withMetadataImage(new MetadataImageBuilder()
+                .addTopic(fooTopicId, fooTopicName, 2)
+                .addRacks()
+                .build())
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withSubscriptionMetadata(new HashMap<String, TopicMetadata>() 
{
+                    {
+                        put(fooTopicName, new TopicMetadata(fooTopicId, 
fooTopicName, 2, mkMapOfPartitionRacks(2)));
+                    }
+                })
+                .withMember(new ConsumerGroupMember.Builder(memberId)
+                    .setInstanceId(instanceId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(10)
+                    
.setSubscribedTopicNames(Collections.singletonList(fooTopicName))
+                    .setAssignedPartitions(mkAssignment(
+                        mkTopicAssignment(fooTopicId, 0, 1)))
+                    .build())
+                .withAssignment(memberId, mkAssignment(
+                    mkTopicAssignment(fooTopicId, 0, 1)))
+                .withAssignmentEpoch(10))
+            .build();
+        
context.groupMetadataManager.consumerGroup(groupId).setMetadataRefreshDeadline(Long.MAX_VALUE,
 10);
+
+        JoinGroupRequestData request = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(UNKNOWN_MEMBER_ID)
+            .withGroupInstanceId(instanceId)
+            .withProtocols(GroupMetadataManagerTestContext.toRangeProtocol(
+                Collections.singletonList(fooTopicName),
+                Collections.emptyList()))
+            .build();
+
+        // The static member joins with UNKNOWN_MEMBER_ID.
+        GroupMetadataManagerTestContext.JoinResult joinResult = 
context.sendClassicGroupJoin(
+            request,
+            true
+        );
+        String newMemberId = joinResult.joinFuture.get().memberId();
+
+        ConsumerGroupMember expectedMember = new 
ConsumerGroupMember.Builder(newMemberId)
+            .setMemberEpoch(0)
+            .setPreviousMemberEpoch(0)
+            .setInstanceId(instanceId)
+            .setState(MemberState.UNREVOKED_PARTITIONS)
+            .setClientId("client")
+            .setClientHost("localhost/127.0.0.1")
+            .setSubscribedTopicNames(Collections.singletonList(fooTopicName))
+            .setRebalanceTimeoutMs(500)
+            .setSupportedClassicProtocols(request.protocols())
+            .setPartitionsPendingRevocation(mkAssignment(
+                mkTopicAssignment(fooTopicId, 0, 1)))
+            .build();
+
+        List<Record> expectedRecords = Arrays.asList(
+            // Remove the old static member.
+            RecordHelpers.newCurrentAssignmentTombstoneRecord(groupId, 
memberId),
+            RecordHelpers.newTargetAssignmentTombstoneRecord(groupId, 
memberId),
+            RecordHelpers.newMemberSubscriptionTombstoneRecord(groupId, 
memberId),
+
+            // Create the new static member.
+            RecordHelpers.newMemberSubscriptionRecord(groupId, expectedMember),
+            RecordHelpers.newTargetAssignmentRecord(groupId, newMemberId, 
Collections.emptyMap()),
+            RecordHelpers.newTargetAssignmentEpochRecord(groupId, 10),
+            RecordHelpers.newCurrentAssignmentRecord(groupId, expectedMember)
+        );
+        assertRecordsEquals(expectedRecords, joinResult.records);
+
+        assertTrue(joinResult.joinFuture.isDone());
+        assertEquals(
+            new JoinGroupResponseData()
+                .setMemberId(newMemberId)
+                .setGenerationId(0)
+                .setProtocolType(ConsumerProtocol.PROTOCOL_TYPE)
+                .setProtocolName("range"),
+            joinResult.joinFuture.get()
+        );
+
+        context.assertSessionTimeout(groupId, newMemberId, 45000);
+        context.assertSyncTimeout(groupId, newMemberId, 
request.rebalanceTimeoutMs());
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"", "instance-id"})
+    public void testConsumerGroupRejoinWithExistingMember(String instanceId) 
throws Exception {
+        String groupId = "group-id";
+        String memberId1 = Uuid.randomUuid().toString();
+        String memberId2 = Uuid.randomUuid().toString();
+        Uuid fooTopicId = Uuid.randomUuid();
+        String fooTopicName = "foo";
+        Uuid barTopicId = Uuid.randomUuid();
+        String barTopicName = "bar";
+
+        MockPartitionAssignor assignor = new MockPartitionAssignor("range");
+        JoinGroupRequestData.JoinGroupRequestProtocolCollection protocols =
+            GroupMetadataManagerTestContext.toRangeProtocol(
+                Arrays.asList(fooTopicName, barTopicName),
+                Arrays.asList(new TopicPartition(fooTopicName, 0), new 
TopicPartition(fooTopicName, 1))
+            );
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withAssignors(Collections.singletonList(assignor))
+            .withMetadataImage(new MetadataImageBuilder()
+                .addTopic(fooTopicId, fooTopicName, 2)
+                .addTopic(barTopicId, barTopicName, 1)
+                .addRacks()
+                .build())
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withSubscriptionMetadata(new HashMap<String, TopicMetadata>() 
{
+                    {
+                        put(fooTopicName, new TopicMetadata(fooTopicId, 
fooTopicName, 2, mkMapOfPartitionRacks(2)));
+                        put(barTopicName, new TopicMetadata(barTopicId, 
barTopicName, 2, mkMapOfPartitionRacks(1)));
+                    }
+                })
+                .withMember(new ConsumerGroupMember.Builder(memberId1)
+                    .setInstanceId(instanceId)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(10)
+                    .setRebalanceTimeoutMs(500)
+                    .setClientId("client")
+                    .setClientHost("localhost/127.0.0.1")
+                    .setSupportedClassicProtocols(protocols)
+                    .setSubscribedTopicNames(Arrays.asList(fooTopicName, 
barTopicName))
+                    .build())
+                .withMember(new ConsumerGroupMember.Builder(memberId2)
+                    .setState(MemberState.STABLE)
+                    .setMemberEpoch(10)
+                    .setPreviousMemberEpoch(10)
+                    .setRebalanceTimeoutMs(500)
+                    .setClientId("client")
+                    .setClientHost("localhost/127.0.0.1")
+                    .setSubscribedTopicNames(Arrays.asList(fooTopicName, 
barTopicName))
+                    .build())
+                .withAssignment(memberId1, mkAssignment(
+                    mkTopicAssignment(fooTopicId, 0, 1)))
+                .withAssignment(memberId2, mkAssignment(
+                    mkTopicAssignment(barTopicId, 0)))
+                .withAssignmentEpoch(10))
+            .build();
+        
context.groupMetadataManager.consumerGroup(groupId).setMetadataRefreshDeadline(Long.MAX_VALUE,
 10);
+
+        JoinGroupRequestData request = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(memberId1)
+            .withGroupInstanceId(instanceId)
+            .withProtocols(protocols)
+            .build();
+
+        // The member rejoins with the same member id and protocols.
+        GroupMetadataManagerTestContext.JoinResult joinResult = 
context.sendClassicGroupJoin(request);
+        assertEquals(Collections.emptyList(), joinResult.records);
+        assertEquals(
+            new JoinGroupResponseData()
+                .setMemberId(memberId1)
+                .setGenerationId(10)
+                .setProtocolType(ConsumerProtocol.PROTOCOL_TYPE)
+                .setProtocolName("range"),
+            joinResult.joinFuture.get()
+        );
+        context.assertSyncTimeout(groupId, memberId1, 
request.rebalanceTimeoutMs());
+    }
+
+    @Test
+    public void testConsumerGroupJoinStaticMemberWithUnknownInstanceId() 
throws Exception {
+        String groupId = "group-id";
+        String instanceId = "instance-id";
+        String memberId1 = Uuid.randomUuid().toString();
+        String memberId2 = Uuid.randomUuid().toString();
+        String fooTopicName = "foo";
+        String barTopicName = "bar";
+
+        JoinGroupRequestData.JoinGroupRequestProtocolCollection protocols =
+            GroupMetadataManagerTestContext.toRangeProtocol(
+                Arrays.asList(fooTopicName, barTopicName),
+                Arrays.asList(new TopicPartition(fooTopicName, 0), new 
TopicPartition(fooTopicName, 1))
+            );
+        // Set up a ConsumerGroup with no static member.
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withMember(new ConsumerGroupMember.Builder(memberId1)
+                    .setSupportedClassicProtocols(protocols)
+                    .build())
+                .withMember(new ConsumerGroupMember.Builder(memberId2)
+                    .build()))
+            .build();
+
+        // The member joins with an instance id.
+        JoinGroupRequestData request = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(memberId1)
+            .withGroupInstanceId(instanceId)
+            .withProtocols(protocols)
+            .build();
+
+        assertThrows(UnknownMemberIdException.class, () -> 
context.sendClassicGroupJoin(request));
+    }
+
+    @Test
+    public void testConsumerGroupJoinStaticMemberWithUnmatchedMemberId() 
throws Exception {
+        String groupId = "group-id";
+        String instanceId = "instance-id";
+        String memberId1 = Uuid.randomUuid().toString();
+        String memberId2 = Uuid.randomUuid().toString();
+        String fooTopicName = "foo";
+        String barTopicName = "bar";
+
+        JoinGroupRequestData.JoinGroupRequestProtocolCollection protocols =
+            GroupMetadataManagerTestContext.toRangeProtocol(
+                Arrays.asList(fooTopicName, barTopicName),
+                Arrays.asList(new TopicPartition(fooTopicName, 0), new 
TopicPartition(fooTopicName, 1))
+            );
+        GroupMetadataManagerTestContext context = new 
GroupMetadataManagerTestContext.Builder()
+            .withConsumerGroup(new ConsumerGroupBuilder(groupId, 10)
+                .withMember(new ConsumerGroupMember.Builder(memberId1)
+                    .setInstanceId(instanceId)
+                    .setSupportedClassicProtocols(protocols)
+                    .build())
+                .withMember(new ConsumerGroupMember.Builder(memberId2)
+                    .build()))
+            .build();
+
+        // The member joins with the same instance id and a different member 
id.
+        JoinGroupRequestData request = new 
GroupMetadataManagerTestContext.JoinGroupRequestBuilder()
+            .withGroupId(groupId)
+            .withMemberId(Uuid.randomUuid().toString())
+            .withGroupInstanceId(instanceId)
+            .withProtocols(protocols)
+            .build();
+
+        assertThrows(FencedInstanceIdException.class, () -> 
context.sendClassicGroupJoin(request));
+    }
+

Review Comment:
   Then should we avoid using range if the version is 0(?)



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