stanislavkozlovski commented on a change in pull request #7498:
URL: https://github.com/apache/kafka/pull/7498#discussion_r521999932



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/producer/internals/Sender.java
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@@ -659,6 +655,12 @@ else if (error == Errors.CLUSTER_AUTHORIZATION_FAILED)
             this.accumulator.unmutePartition(batch.topicPartition);
     }
 
+    private String formatErrMsg(ProduceResponse.PartitionResponse response) {

Review comment:
       I'm wondering if we should print an error message even if one is not 
provided - we could get the default error message from the `ApiException` 
linked to the `Errors`. An example would be for the 
OUT_OF_ORDER_SEQUENCE_NUMBER case:
   
   Without the change:
   ```
   [2020-11-12 11:26:26,775] WARN Got error produce response with correlation 
id 2 on topic-partition test-0, retrying (2147483646 attempts left). Error: 
OUT_OF_ORDER_SEQUENCE_NUMBER.(org.apache.kafka.clients.producer.internals.Sender:610)
   ```
   
   
   ```
   [2020-11-12 11:26:26,775] WARN Got error produce response with correlation 
id 2 on topic-partition test-0, retrying (2147483646 attempts left). Error: 
OUT_OF_ORDER_SEQUENCE_NUMBER. Error Message: The broker received an out of 
order sequence number. (org.apache.kafka.clients.producer.internals.Sender:610)
   ```




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