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

["Matthias J. Sax (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16770582#comment-16770582 ] 

Matthias J. Sax commented on KAFKA-4808:
----------------------------------------

Moving all major/minor/trivial tickets that are not merged yet out of 2.2 release.

> 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
>            Assignee: Mayuresh Gharat
>            Priority: Major
>             Fix For: 2.2.0
>
>
> 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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