Hi frakass, I think the most difference for sync and async send (or "publish" like you said), is the throughput. You said the performance is almost the same, and I would guess the "acks" config in your environment might be 0? Or maybe the produce rate is slow? Or "max.in.flight.requests.per.connection" is 1? Usually, when "acks=all", you have to wait for the records completely replicated into all brokers before server response in "sync" mode, which is why the throughput will be slow. Compared with async mode, the producer send will return immediately after appending the records, and wait for the response in callback function, no matter it's acks=0 or acks=all.
Hope that helps. Luke On Wed, Feb 16, 2022 at 9:10 AM frakass <capitnfrak...@free.fr> wrote: > for a producer, is there a principle that when to use sync publishing, > and when to use async publishing? > > for the simple format messages, i have tested both, their performance > are almost the same. > > Thank you. > frakass >
