gabriellefu commented on code in PR #23121:
URL: https://github.com/apache/kafka/pull/23121#discussion_r3917564879


##########
core/src/main/scala/kafka/server/ControllerConfigurationValidator.scala:
##########
@@ -134,8 +144,12 @@ class ControllerConfigurationValidator(kafkaConfig: 
KafkaConfig) extends Configu
         ClientMetricsConfigs.validate(resource.name(), filteredConfigs)
       case GROUP =>
         validateGroupName(resource.name())
-        val filteredConfigs = filterAndValidateNullConfigs(newConfigs, "group")
-        GroupConfig.validate(filteredConfigs, 
kafkaConfig.groupCoordinatorConfig, kafkaConfig.shareGroupConfig)
+        // Skip once every broker in the cluster is guaranteed to already 
validate this on the
+        // forwarding broker. See the class-level doc for why this can't just 
be removed outright.

Review Comment:
   since we are not adding forwarded to the validation, we can't inline this 
comment anymore, thanks



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