chia7712 commented on code in PR #21005:
URL: https://github.com/apache/kafka/pull/21005#discussion_r2879239882


##########
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 guess we still can't do the same validation in the controller. 
Otherwise, step 5 will fail.
   
   not really. In step 5, since the broker is still offline, we need to use the 
controller to uncordon the log directory. The controller can still perform the 
validation, because removing a directory from the cordon list will always be 
valid against the known static configs



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