jsancio commented on code in PR #21005:
URL: https://github.com/apache/kafka/pull/21005#discussion_r2818458470


##########
core/src/main/scala/kafka/server/ConfigAdminManager.scala:
##########
@@ -112,48 +112,33 @@ class ConfigAdminManager(nodeId: Int,
     })
     request.resources().forEach(resource => {
       if (!results.containsKey(resource)) {
-        val resourceType = ConfigResource.Type.forId(resource.resourceType())
-        val configResource = new ConfigResource(resourceType, 
resource.resourceName())
-        try {
-          if (containsDuplicates(resource.configs().asScala.map(_.name()))) {
-            throw new InvalidRequestException("Error due to duplicate config 
keys")
-          }
-          val nullUpdates = new util.ArrayList[String]()
-          resource.configs().forEach { config =>
-            if (config.configOperation() != AlterConfigOp.OpType.DELETE.id() &&
-              config.value() == null) {
-              nullUpdates.add(config.name())
+        processConfigResource(

Review Comment:
   I think that we should implement (3) but I should point out that (3) is a 
best effort check for "well behaved" clients. It is possible for a client to 
directly send an EnvelopeRequest to the controller as long as they have cluster 
action privileges.



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