chia7712 commented on code in PR #20728:
URL: https://github.com/apache/kafka/pull/20728#discussion_r2445324112


##########
clients/src/main/java/org/apache/kafka/clients/consumer/ConsumerGroupMetadata.java:
##########
@@ -31,6 +31,10 @@ public class ConsumerGroupMetadata {
     private final String memberId;
     private final Optional<String> groupInstanceId;
 
+    /**
+     * @deprecated Since 4.2, please use {@link KafkaConsumer#groupMetadata()} 
instead. This class will be an interface in Kafka 5.0.
+     */
+    @Deprecated(since = "4.2", forRemoval = true)

Review Comment:
   Those changes cause following warnings.
   ```
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/consumer/StickyAssignorTest.java:323:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
           assignor.onAssignment(new 
ConsumerPartitionAssignor.Assignment(ownedPartitionsInUserdata), new 
ConsumerGroupMetadata(groupId, generationId, consumer1, Optional.empty()));
                                                                                
                      ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumerTest.java:1385:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
           final ConsumerGroupMetadata groupMetadataAfterUnsubscribe = new 
ConsumerGroupMetadata(
                                                                       ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/consumer/CooperativeStickyAssignorTest.java:63:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
           assignor.onAssignment(new 
ConsumerPartitionAssignor.Assignment(partitions), new 
ConsumerGroupMetadata(groupId, generationId, consumer1, Optional.empty()));
                                                                                
       ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/consumer/CooperativeStickyAssignorTest.java:74:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
           assignor.onAssignment(new 
ConsumerPartitionAssignor.Assignment(partitions), new 
ConsumerGroupMetadata(groupId, generationId, consumer1, Optional.empty()));
                                                                                
       ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/consumer/CooperativeStickyAssignorTest.java:87:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
           assignor.onAssignment(null, new 
ConsumerGroupMetadata("dummy-group-id", generation, "dummy-member-id", 
Optional.empty()));
                                       ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/consumer/CooperativeStickyAssignorTest.java:149:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
           assignor.onAssignment(new 
ConsumerPartitionAssignor.Assignment(ownedPartitionsInUserdata), new 
ConsumerGroupMetadata(groupId, generationId, consumer1, Optional.empty()));
                                                                                
                      ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/producer/KafkaProducerTest.java:2005:
 warning: [removal] ConsumerGroupMetadata(String) in ConsumerGroupMetadata has 
been deprecated and marked for removal
               producer.sendOffsetsToTransaction(Collections.emptyMap(), new 
ConsumerGroupMetadata(groupId));
                                                                         ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/producer/KafkaProducerTest.java:2231:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
               ConsumerGroupMetadata groupMetadata = new 
ConsumerGroupMetadata(groupId,
                                                     ^
   
/home/chia7712/project/kafka/clients/src/test/java/org/apache/kafka/clients/producer/KafkaProducerTest.java:2246:
 warning: [removal] ConsumerGroupMetadata(String,int,String,Optional<String>) 
in ConsumerGroupMetadata has been deprecated and marked for removal
           verifyInvalidGroupMetadata(new ConsumerGroupMetadata("group", 2, 
JoinGroupRequest.UNKNOWN_MEMBER_ID, Optional.empty()));
   ```
   
   I assume these will be fixed when the new interface is introduced?



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