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https://issues.apache.org/jira/browse/KAFKA-12717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17339833#comment-17339833
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Chris Egerton commented on KAFKA-12717:
---------------------------------------
Filed
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-736%3A+Removal+of+Connect%27s+internal+converter+properties]
for these changes.
> Remove internal converter config properties
> -------------------------------------------
>
> Key: KAFKA-12717
> URL: https://issues.apache.org/jira/browse/KAFKA-12717
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Reporter: Chris Egerton
> Assignee: Chris Egerton
> Priority: Major
> Labels: needs-kip
>
> KAFKA-5540 /
> [KIP-174|https://cwiki.apache.org/confluence/display/KAFKA/KIP-174+-+Deprecate+and+remove+internal+converter+configs+in+WorkerConfig]
> deprecated but did not officially remove Connect's internal converter worker
> config properties. With the upcoming 3.0 release, we can make the
> backwards-incompatible change of completely removing these properties once
> and for all.
>
> One migration path for users who may still be running Connect clusters with
> different internal converters can be:
> # Stop all workers on the cluster
> # For each internal topic (config, offsets, and status):
> ## Create a new topic to take the place of the existing one
> ## For every message in the existing topic:
> ### Deserialize the message's key and value using the Connect cluster's old
> internal key and value converters
> ### Serialize the message's key and value using the [JSON
> converter|https://github.com/apache/kafka/blob/trunk/connect/json/src/main/java/org/apache/kafka/connect/json/JsonConverter.java]
> with schemas disabled (by setting the {{schemas.enable}} property to
> {{false}})
> ### Write a message with the new key and value to the new internal topic
> # Reconfigure each Connect worker to use the newly-created internal topics
> from step 2
> # Start all workers on the cluster
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