kirktrue commented on code in PR #14879:
URL: https://github.com/apache/kafka/pull/14879#discussion_r1412683354


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
##########
@@ -398,6 +466,38 @@ public class AsyncKafkaConsumer<K, V> implements 
ConsumerDelegate<K, V> {
                 requestManagersSupplier);
     }
 
+    private Optional<ConsumerGroupMetadata> initializeGroupMetadata(final 
ConsumerConfig config,
+                                                                    final 
GroupRebalanceConfig groupRebalanceConfig) {
+        final Optional<ConsumerGroupMetadata> groupMetadata = 
initializeGroupMetadata(
+            groupRebalanceConfig.groupId,
+            groupRebalanceConfig.groupInstanceId
+        );
+        if (!groupMetadata.isPresent()) {
+            config.ignore(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG);
+            config.ignore(THROW_ON_FETCH_STABLE_OFFSET_UNSUPPORTED);
+        }
+        return groupMetadata;
+    }
+
+    private Optional<ConsumerGroupMetadata> initializeGroupMetadata(final 
String groupId,
+                                                                    final 
Optional<String> groupInstanceId) {
+        if (groupId != null) {
+            if (groupId.isEmpty()) {
+                throwInInvalidGroupIdException();

Review Comment:
   Oh, the line after `throwInInvalidGroupIdException` is just to appease the 
compiler?



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