[jira] [Created] (KAFKA-4808) send of null key to a compacted topic should throw error back to user

["Ismael Juma (JIRA)" <ji...@apache.org>]

Ismael Juma created KAFKA-4808:
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             Summary: send of null key to a compacted topic should throw error back to user
                 Key: KAFKA-4808
                 URL: https://issues.apache.org/jira/browse/KAFKA-4808
             Project: Kafka
          Issue Type: Bug
          Components: producer 
    Affects Versions: 0.10.2.0
            Reporter: Ismael Juma
             Fix For: 0.10.3.0


If a message with a null key is produced to a compacted topic, the broker returns `CorruptRecordException`, which is a retriable exception. As such, the producer keeps retrying until retries are exhausted or request.timeout.ms expires and eventually throws a TimeoutException. This is confusing and not user-friendly.

We should throw a meaningful error back to the user. From an implementation perspective, we would have to use a non retriable error code to avoid this issue.



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