divijvaidya commented on code in PR #16418:
URL: https://github.com/apache/kafka/pull/16418#discussion_r1928574640

##########
clients/src/main/java/org/apache/kafka/common/network/Selector.java:
##########
@@ -365,6 +365,10 @@ private KafkaChannel 
buildAndAttachKafkaChannel(SocketChannel socketChannel, Str
             // Ideally, these resources are closed by the KafkaChannel but if 
the KafkaChannel is not created to an
             // error, this builder should close the resources it has created 
instead.
             Utils.closeQuietly(metadataRegistry, "metadataRegistry");
+            // If an Authentication Failure is encountered, throw that error 
directly.
+            if (e instanceof AuthenticationException) {

Review Comment:
   should this just be for AuthN or any fatal in general? e.g. 
AuthorizationException should also be treated similarily.



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