Pushing a couple terabytes a day through kafka 0.7. We don't use zookeeper on the producing side and it alleviates this a lot. It's a little more brittle pushing host/partition configs around, but we accepted loss of data in this system and its worth the simplicity of it. Also played with the idea of putting an elb in front.
I'm having way more trouble with the consumer being dumb with the way it distributes topics and partitions. End up with lots of idle consumers, while others are way above max.