Matthias J. Sax created KAFKA-18523:
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Summary: 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
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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