chia7712 commented on code in PR #18196:
URL: https://github.com/apache/kafka/pull/18196#discussion_r1922328336


##########
core/src/main/scala/kafka/server/metadata/DynamicClientQuotaPublisher.scala:
##########
@@ -48,9 +51,20 @@ class DynamicClientQuotaPublisher(
   ): Unit = {
     val deltaName = s"MetadataDelta up to 
${newImage.highestOffsetAndEpoch().offset}"
     try {
-        Option(delta.clientQuotasDelta()).foreach { clientQuotasDelta =>
-          clientQuotaMetadataManager.update(clientQuotasDelta)
+      quotaManagers.clientQuotaCallback().ifPresent(clientQuotaCallback => {
+        if (delta.topicsDelta() != null || delta.clusterDelta() != null) {

Review Comment:
   How about moving this callback trigger to a individual publisher? That can 
decouple the callback and other publisher. Also, that can avoid producing 
incorrect error message? 



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