We have a few mailing lists hosted by Apache:
- firstname.lastname@example.org: A list for general user questions about Kafka™. To subscribe, send an email to email@example.com. Archives are available here.
- firstname.lastname@example.org: A list for discussion on Kafka development. To subscribe, send an email to email@example.com. Archives available here.
- firstname.lastname@example.org: A list to track Kafka commits. To subscribe, send an email to email@example.com. Archives available here.
A searchable archive of the mailing lists is available at search-hadoop.com.
To unsubscribe from any of these you just change the word "subscribe" in the above to "unsubscribe".
Prior to the move to Apache we had a Google group we used for discussion. Archives can be found here. After that we were in Apache Incubator which has its own archives for user, dev, and commit lists.
We have an IRC channel where there is often a few people hanging around if you want an interactive discussion. You can find us on chat.freenode.net in #apache-kafka room (previously #kafka). The irc log can be found here.