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https://issues.apache.org/jira/browse/KAFKA-3832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719142#comment-16719142
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Renato Mefi commented on KAFKA-3832:
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Indeed, I've attempted to fix it [https://github.com/apache/kafka/pull/6027]
It doesn't seem to be a BCC but I'm unsure as well
> Kafka Connect's JSON Converter never outputs a null value
> ---------------------------------------------------------
>
> Key: KAFKA-3832
> URL: https://issues.apache.org/jira/browse/KAFKA-3832
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 0.9.0.1
> Reporter: Randall Hauch
> Assignee: Prasanna Subburaj
> Priority: Major
> Labels: newbie
>
> Kafka Connect's JSON Converter will never output a null value when
> {{enableSchemas=true}}. This means that when a connector outputs a
> {{SourceRecord}} with a null value, the JSON Converter will always produce a
> message value with:
> {code:javascript}
> {
> "schema": null,
> "payload": null
> }
> {code}
> And, this means that while Kafka log compaction will always be able to remove
> earlier messages with the same key, log compaction will never remove _all_ of
> the messages with the same key.
> The JSON Connector's {{fromConnectData(...)}} should always return null when
> it is supplied a null value.
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