chia7712 commented on code in PR #20159:
URL: https://github.com/apache/kafka/pull/20159#discussion_r2563628534


##########
clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java:
##########
@@ -1237,7 +1259,11 @@ private ClusterAndWaitTime waitOnMetadata(String topic, 
Integer partition, long
                 if (metadata.getError(topic) != null && 
metadata.getError(topic).exception() instanceof RetriableException) {
                     throw new TimeoutException(errorMessage, 
metadata.getError(topic).exception());
                 }
-                throw new TimeoutException(errorMessage);
+                if (metadata.getError(topic) != null) {

Review Comment:
   I have to say, my concern remains the inconsistent exception hierarchy. This 
inconsistency could lead users to mistakenly catch a non-retryable exception. 
   
   ping @mjsax WDYT?



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