m1a2st commented on code in PR #18196:
URL: https://github.com/apache/kafka/pull/18196#discussion_r1886806255


##########
core/src/main/scala/kafka/server/metadata/DynamicClientQuotaPublisher.scala:
##########
@@ -48,6 +51,11 @@ class DynamicClientQuotaPublisher(
   ): Unit = {
     val deltaName = s"MetadataDelta up to 
${newImage.highestOffsetAndEpoch().offset}"
     try {
+        val clientQuotaCallback = 
conf.getConfiguredInstance(QuotaConfig.CLIENT_QUOTA_CALLBACK_CLASS_CONFIG, 
classOf[ClientQuotaCallback])
+        if (clientQuotaCallback != null) {

Review Comment:
   I don't think we need to check for `DefaultQuotaCallback`, because the 
default value of `QuotaConfig.CLIENT_QUOTA_CALLBACK_CLASS_CONFIG` is `null`, 
not `DefaultQuotaCallback`.



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