ijuma commented on code in PR #18456:
URL: https://github.com/apache/kafka/pull/18456#discussion_r1910474451


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -3208,35 +3208,18 @@ class KafkaApis(val requestChannel: RequestChannel,
         
describeUserScramCredentialsRequest.getErrorResponse(requestThrottleMs, 
Errors.CLUSTER_AUTHORIZATION_FAILED.exception))
     } else {
       metadataSupport match {
-        case ZkSupport(adminManager, controller, zkClient, forwardingManager, 
metadataCache, _) =>
-          val result = adminManager.describeUserScramCredentials(
-            
Option(describeUserScramCredentialsRequest.data.users).map(_.asScala.map(_.name).toList))
-          requestHelper.sendResponseMaybeThrottle(request, requestThrottleMs =>
-            new 
DescribeUserScramCredentialsResponse(result.setThrottleTimeMs(requestThrottleMs)))
         case RaftSupport(_, metadataCache) =>
           val result = 
metadataCache.describeScramCredentials(describeUserScramCredentialsRequest.data())
           requestHelper.sendResponseMaybeThrottle(request, requestThrottleMs =>
             new 
DescribeUserScramCredentialsResponse(result.setThrottleTimeMs(requestThrottleMs)))
+        case _ =>
+         throw KafkaApis.shouldNeverReceive(request)
       }
     }
   }
 
   def handleAlterUserScramCredentialsRequest(request: RequestChannel.Request): 
Unit = {
-    val zkSupport = 
metadataSupport.requireZkOrThrow(KafkaApis.shouldAlwaysForward(request))
-    val alterUserScramCredentialsRequest = 
request.body[AlterUserScramCredentialsRequest]
-
-    if (!zkSupport.controller.isActive) {
-      requestHelper.sendResponseMaybeThrottle(request, requestThrottleMs =>
-        alterUserScramCredentialsRequest.getErrorResponse(requestThrottleMs, 
Errors.NOT_CONTROLLER.exception))
-    } else if (authHelper.authorize(request.context, ALTER, CLUSTER, 
CLUSTER_NAME)) {
-      val result = zkSupport.adminManager.alterUserScramCredentials(
-        alterUserScramCredentialsRequest.data.upsertions().asScala, 
alterUserScramCredentialsRequest.data.deletions().asScala)
-      requestHelper.sendResponseMaybeThrottle(request, requestThrottleMs =>
-        new 
AlterUserScramCredentialsResponse(result.setThrottleTimeMs(requestThrottleMs)))
-    } else {
-      requestHelper.sendResponseMaybeThrottle(request, requestThrottleMs =>
-        alterUserScramCredentialsRequest.getErrorResponse(requestThrottleMs, 
Errors.CLUSTER_AUTHORIZATION_FAILED.exception))
-    }
+    throw KafkaApis.shouldAlwaysForward(request)

Review Comment:
   Same thing I said here: 
https://github.com/apache/kafka/pull/18465/files#r1910472130



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