Hi, I was looking into the different between acks = 0 and acks = 1 in the new producer, and was a bit surprised at what I found.
Basically, if I understand correctly, the only difference is that with acks = 0, if the leader fails to append locally, it closes the network connection silently and with acks = 1, it sends an actual error message. Which seems to mean that with acks = 0, any failed produce will lead to metadata refresh and a retry (because network error), while acks = 1 will lead to either retries or abort, depending on the error. Not only this doesn't match the documentation, it doesn't even make much sense... "acks = 0" was supposed to somehow makes things "less safe but faster", and it doesn't seem to be doing that any more. I'm not even sure there's any case where the "acks = 0" behavior is desirable. Is it my misunderstanding, or did we somehow screw up the logic here? Gwen
