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https://issues.apache.org/jira/browse/KAFKA-5540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324350#comment-16324350
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Randall Hauch commented on KAFKA-5540:
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[KIP-174|https://cwiki.apache.org/confluence/display/KAFKA/KIP-174+-+Deprecate+and+remove+internal+converter+configs+in+WorkerConfig]
covers this and is now undergoing voting.
> Deprecate and remove internal converter configs
> -----------------------------------------------
>
> Key: KAFKA-5540
> URL: https://issues.apache.org/jira/browse/KAFKA-5540
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 0.11.0.0
> Reporter: Ewen Cheslack-Postava
> Labels: needs-kip
>
> The internal.key.converter and internal.value.converter were original exposed
> as configs because a) they are actually pluggable and b) providing a default
> would require relying on the JsonConverter always being available, which
> until we had classloader isolation it was possible might be removed for
> compatibility reasons.
> However, this has ultimately just caused a lot more trouble and confusion
> than it is worth. We should deprecate the configs, give them a default of
> JsonConverter (which is also kind of nice since it results in human-readable
> data in the internal topics), and then ultimately remove them in the next
> major version.
> These are all public APIs so this will need a small KIP before we can make
> the change.
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