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https://issues.apache.org/jira/browse/KAFKA-18523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913108#comment-17913108
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TengYao Chi commented on KAFKA-18523:
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Hi [~mjsax]
I would take a look 😺
> Improve default.replication.factor docs
> ---------------------------------------
>
> Key: KAFKA-18523
> URL: https://issues.apache.org/jira/browse/KAFKA-18523
> Project: Kafka
> Issue Type: Task
> Components: docs
> Reporter: Matthias J. Sax
> Assignee: TengYao Chi
> Priority: Minor
>
> We had a user report, that the `default.replication.factor` was not picked up
> correctly by a KafkaStreams app, which by default uses `-1` as client side
> config for `replication.factor` when creating internal topics.
> Turns out, that there seems to be a difference between "regular brokers" and
> "controller nodes" in KRaft. This is not clear from the docs.
> From the user:
> {quote}Although the config setting {{default.replication.factor}} is listed
> under "Broker configuration" in the Kafka docs, digging in the Kafka source
> code revealed that the {{-1}} value is actually mapped on the controllers,
> not the "normal" brokers. Adding {{default.replication.factor}} to the
> controllers as well, resolved the problem.
> {quote}
> Would be great to improve the docs accordingly. Not sure if this might apply
> to other configs, too.
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