Just some additions to Chia-Chun's response: each topic can have multiple partitions and each partition can be replicated as multiple replicas on different machines, acks = n means that the data sent to a particular partition has been replicated to at least n replicas.
Guozhang On Sun, Nov 9, 2014 at 11:27 PM, Chia-Chun Shih <chiachun.s...@gmail.com> wrote: > Dear Genlong, > > "New Producer Configs" is for upcoming versions. If you are using 0.8.1, > please refer to "Producer Configs". > > acks=n, in which n means number of in-sync replicas, not number of > partitions. > > regards, > Chia-Chun > > 2014-11-10 10:51 GMT+08:00 hi <995174...@qq.com>: > > > Dear sir or madam, > > > > There is one question when I'm using Kafka: > > From the "documentation:New Producer Configs" ,I get that acks=n > means > > the number of acknowledgments the producer requires the leader to have > > received before considering a request complete. But why can the producer > > send messages successfully when I use the Producer API and the acks is > > set to 2 (the number of partitions is 3 but there is only one partition > > can work)? > > > > Thanks a lot and look forward to hearing from you soon. > > > > Best Regards, > > > > Genlong Wang > > > > > > > -- -- Guozhang
