showuon commented on code in PR #17524:
URL: https://github.com/apache/kafka/pull/17524#discussion_r1858477234


##########
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java:
##########
@@ -2557,7 +2557,10 @@ boolean handleUnsupportedVersionException(final 
UnsupportedVersionException exce
                     return false;
                 }
 
-                if (exception.getMessage().contains("Including fenced broker 
endpoints is not supported with version")) {
+                // If unsupportedVersion exception was caused by the option to 
include fenced brokers (only supported for version 1+)
+                // then we should not fall back to the metadataRequest.
+                if (options.includeFencedBrokers()) {
+                    log.error("Including fenced broker endpoints is not 
supported with " + exception.getMessage());

Review Comment:
   I'm not sure the exception message when unsupportedVersionException thrown. 
You need to check again in integration test. The `Api DESCRIBE_CLUSTER with 
version 1` is from `mockClient`, not real `networkClient`. FYI.



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