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https://issues.apache.org/jira/browse/NIFI-14559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18004630#comment-18004630
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Matthias Küng commented on NIFI-14559:
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I guess it's easier to use String keys as a Event design guideline so that
generic processing will be easier.
> PublishKafka support for primitive key with schema
> --------------------------------------------------
>
> Key: NIFI-14559
> URL: https://issues.apache.org/jira/browse/NIFI-14559
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Affects Versions: 2.3.0
> Reporter: Matthias Küng
> Priority: Major
>
> For cross domain state topics (compacted) I have the requirement to publish
> into topics with primitive keys (mainly string, integer or long) which will
> be consumed with the AvroSerializer.
> Therefore these records have to be published with a Confluent encoded schema
> reference.
> *Publish Strategy "Use Wrapper"*
> PublishKafka doesn't apply "Record Key Writer" if the key is a primitive. The
> writer is only called if key is an object with attributes.
> If a writer is set, it should be called in any case to encode the key - no
> matter whether the key is a primitive value or object.
> *Publish Strategy "Use Content as Record Value"*
> The property "Record Key Writer" should be optionally available and if
> specified applied to the "Message Key Field" / "Kafka Key" in the same way
> as with the "Use Wrapper" strategy.
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