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https://issues.apache.org/jira/browse/KAFKA-13298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419166#comment-17419166
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Andy Chambers commented on KAFKA-13298:
---------------------------------------
I made a PR for this but initially did not use the correct title format which I
suppose is why it was never automatically linked. Sorry about that. But here is
a link to the PR.
https://github.com/apache/kafka/pull/11355
> Improve documentation on EOS KStream requirements
> -------------------------------------------------
>
> Key: KAFKA-13298
> URL: https://issues.apache.org/jira/browse/KAFKA-13298
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 2.8.0
> Reporter: F Méthot
> Priority: Trivial
>
> After posting question on a kafka forum, the following was revealed by kafka
> developer:
> {quote}Is there minimum replication factor required to enable exactly_once
> for topic involved in transactions?
> {quote}
> "Well, technically you can configure the system to use EOS with any
> replication factor. However, using a lower replication factor than 3
> effectively voids EOS. Thus, it’s strongly recommended to use a replication
> factor of 3."
>
> This should be clearly documented in the stream doc:
> [https://kafka.apache.org/28/documentation/streams/developer-guide/config-streams.html]
> Which refers to this broker link
> [https://kafka.apache.org/28/documentation/streams/developer-guide/config-streams.html#streams-developer-guide-processing-guarantedd]
>
>
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