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https://issues.apache.org/jira/browse/KAFKA-9228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17886426#comment-17886426
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Greg Harris commented on KAFKA-9228:
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[~douglasawh] Those log messages are emitted whenever a config has it's secrets
processed, not just after a restart. Since you have two tasks, and you see the
log messages from the ConfigProvider twice, these are probably from the tasks
starting.
The error should only appear if the tasks are on a different machine than the
connector. If you're only running a single machine, then there shouldn't be any
errors, just the connector being restarted periodically. You can look for
"Stopping connector" and "Creating connector" messages emitted every ~60
seconds.
> Reconfigured converters and clients may not be propagated to connector tasks
> ----------------------------------------------------------------------------
>
> Key: KAFKA-9228
> URL: https://issues.apache.org/jira/browse/KAFKA-9228
> Project: Kafka
> Issue Type: Bug
> Components: connect
> Affects Versions: 2.3.0, 2.4.0, 2.3.1, 2.3.2
> Reporter: Chris Egerton
> Assignee: Chris Egerton
> Priority: Major
> Fix For: 3.8.0, 3.7.1
>
>
> If an existing connector is reconfigured but the only changes are to its
> converters and/or Kafka clients (enabled as of
> [KIP-458|https://cwiki.apache.org/confluence/display/KAFKA/KIP-458%3A+Connector+Client+Config+Override+Policy]),
> the changes will not propagate to its tasks unless the connector also
> generates task configs that differ from the existing task configs. Even after
> this point, if the connector tasks are reconfigured, they will still not pick
> up on the new converter and/or Kafka client configs.
> This is because the {{DistributedHerder}} only writes new task configurations
> to the connect config topic [if the connector-provided task configs differ
> from the task configs already in the config
> topic|https://github.com/apache/kafka/blob/e499c960e4f9cfc462f1a05a110d79ffa1c5b322/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/DistributedHerder.java#L1285-L1332],
> and neither of those contain converter or Kafka client configs.
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