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https://issues.apache.org/jira/browse/KAFKA-4808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15886288#comment-15886288
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Mayuresh Gharat commented on KAFKA-4808:
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[~ijuma] I was thinking if throwing "INVALID_REQUEST" exception should work
here, or do we need to add a new Exception type (which would require a KIP)?
> 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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