[brandtg]

Some caveats about Kafka replication are discussed here: https://aphyr.com/posts/293-call-me-maybe-kafka.

It is important to include these in the "exactly-once" discussion... (hard to be exactly-once if messages are lost broker-side).

Also, great discussion from Coda Hale about "CA" systems here: http://codahale.com/you-cant-sacrifice-partition-tolerance/