FrankYang0529 commented on code in PR #17958:
URL: https://github.com/apache/kafka/pull/17958#discussion_r1863713283


##########
core/src/test/scala/unit/kafka/server/ConsumerGroupDescribeRequestTest.scala:
##########
@@ -213,4 +216,111 @@ class ConsumerGroupDescribeRequestTest(cluster: 
ClusterInstance) extends GroupCo
       admin.close()
     }
   }
+
+  @ClusterTest(
+    types = Array(Type.KRAFT),
+    serverProperties = Array(
+      new ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_PARTITIONS_CONFIG, value = "1"),
+      new ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_REPLICATION_FACTOR_CONFIG, value = "1")
+    )
+  )
+  def testConsumerGroupDescribeWithMigrationMember(): Unit = {
+    // Creates the __consumer_offsets topics because it won't be created 
automatically
+    // in this test because it does not use FindCoordinator API.
+    createOffsetsTopic()
+
+    // Create the topic.
+    val topicName = "foo"
+    createTopic(
+      topic = "foo",
+      numPartitions = 3
+    )
+
+    val groupId = "grp"
+
+    // Classic member 1 joins the classic group.
+    val memberId1 = joinDynamicConsumerGroupWithOldProtocol(
+      groupId = groupId,
+      metadata = ConsumerProtocol.serializeSubscription(
+        new ConsumerPartitionAssignor.Subscription(
+          Collections.singletonList(topicName),
+          null,
+          List().asJava
+        )
+      ).array,
+      assignment = ConsumerProtocol.serializeAssignment(
+        new ConsumerPartitionAssignor.Assignment(
+          List(0, 1, 2).map(p => new TopicPartition(topicName, p)).asJava
+        )
+      ).array
+    )._1
+
+    // The joining request with a consumer group member 2 is accepted.
+    consumerGroupHeartbeat(
+      groupId = groupId,
+      memberId = "member-2",
+      rebalanceTimeoutMs = 5 * 60 * 1000,
+      subscribedTopicNames = List(topicName),
+      topicPartitions = List.empty,
+      expectedError = Errors.NONE
+    ).memberId()
+
+    // version 0 doesn't have isClassic field, so isClassic field on member 1 
is false
+    val actual = consumerGroupDescribe(
+      groupIds = List(groupId),
+      includeAuthorizedOperations = true,
+      version = 0.toShort,
+    )
+    assertEquals(1, actual.size)
+    val group = actual.head
+    val member1 = group.members().asScala.find(_.memberId() == memberId1)
+    assertNotNull(member1)
+    assertFalse(member1.get.isClassic)
+
+    // starting from version 1, there is isClassic field in 
ConsumerGroupDescribeResponse
+    for (version <- 1.toShort to 
ApiKeys.CONSUMER_GROUP_DESCRIBE.latestVersion(isUnstableApiEnabled)) {
+      val actual = consumerGroupDescribe(
+        groupIds = List(groupId),
+        includeAuthorizedOperations = true,
+        version = version.toShort,
+      )
+      assertEquals(1, actual.size)
+      val group = actual.head
+      val member1 = group.members().asScala.find(_.memberId() == memberId1)
+      assertNotNull(member1)
+      assertTrue(member1.get.isClassic)
+    }

Review Comment:
   Yes, updated it. Thanks for the suggestion.



##########
core/src/test/scala/unit/kafka/server/ConsumerGroupDescribeRequestTest.scala:
##########
@@ -213,4 +216,111 @@ class ConsumerGroupDescribeRequestTest(cluster: 
ClusterInstance) extends GroupCo
       admin.close()
     }
   }
+
+  @ClusterTest(
+    types = Array(Type.KRAFT),
+    serverProperties = Array(
+      new ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_PARTITIONS_CONFIG, value = "1"),
+      new ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_REPLICATION_FACTOR_CONFIG, value = "1")
+    )
+  )
+  def testConsumerGroupDescribeWithMigrationMember(): Unit = {
+    // Creates the __consumer_offsets topics because it won't be created 
automatically
+    // in this test because it does not use FindCoordinator API.
+    createOffsetsTopic()
+
+    // Create the topic.
+    val topicName = "foo"
+    createTopic(
+      topic = "foo",
+      numPartitions = 3
+    )
+
+    val groupId = "grp"
+
+    // Classic member 1 joins the classic group.
+    val memberId1 = joinDynamicConsumerGroupWithOldProtocol(
+      groupId = groupId,
+      metadata = ConsumerProtocol.serializeSubscription(
+        new ConsumerPartitionAssignor.Subscription(
+          Collections.singletonList(topicName),
+          null,
+          List().asJava
+        )
+      ).array,
+      assignment = ConsumerProtocol.serializeAssignment(
+        new ConsumerPartitionAssignor.Assignment(
+          List(0, 1, 2).map(p => new TopicPartition(topicName, p)).asJava
+        )
+      ).array
+    )._1
+
+    // The joining request with a consumer group member 2 is accepted.
+    consumerGroupHeartbeat(
+      groupId = groupId,
+      memberId = "member-2",
+      rebalanceTimeoutMs = 5 * 60 * 1000,
+      subscribedTopicNames = List(topicName),
+      topicPartitions = List.empty,
+      expectedError = Errors.NONE
+    ).memberId()
+
+    // version 0 doesn't have isClassic field, so isClassic field on member 1 
is false
+    val actual = consumerGroupDescribe(
+      groupIds = List(groupId),
+      includeAuthorizedOperations = true,
+      version = 0.toShort,
+    )
+    assertEquals(1, actual.size)
+    val group = actual.head
+    val member1 = group.members().asScala.find(_.memberId() == memberId1)
+    assertNotNull(member1)
+    assertFalse(member1.get.isClassic)
+
+    // starting from version 1, there is isClassic field in 
ConsumerGroupDescribeResponse
+    for (version <- 1.toShort to 
ApiKeys.CONSUMER_GROUP_DESCRIBE.latestVersion(isUnstableApiEnabled)) {
+      val actual = consumerGroupDescribe(
+        groupIds = List(groupId),
+        includeAuthorizedOperations = true,
+        version = version.toShort,
+      )
+      assertEquals(1, actual.size)
+      val group = actual.head
+      val member1 = group.members().asScala.find(_.memberId() == memberId1)
+      assertNotNull(member1)
+      assertTrue(member1.get.isClassic)
+    }
+
+    // Classic member 1 leaves group.
+    leaveGroup(
+      groupId = groupId,
+      memberId = memberId1,
+      useNewProtocol = false,
+      version = ApiKeys.LEAVE_GROUP.latestVersion(isUnstableApiEnabled)
+    )
+
+    // member 1 joins as consumer group member
+    consumerGroupHeartbeat(
+      groupId = groupId,
+      memberId = memberId1,
+      rebalanceTimeoutMs = 5 * 60 * 1000,
+      subscribedTopicNames = List("foo"),
+      topicPartitions = List.empty,
+      expectedError = Errors.NONE
+    )
+
+    // there is no classic member in the group

Review Comment:
   Updated it. Thanks for the reminder.



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