Hi Sean, you'll want equal or more brokers than your replication factor. Meaning, if your replication factor is 3, you'll want 3 or more brokers.
I'm not sure what Kafka will do if you have fewer brokers than your replication factor. It will either give you the highest replication factor it can (in this case, the number of brokers), or it will put more than one replica on some brokers. My guess is the former, but again, I'm not sure. Hope this helps. Alex On Tue, Feb 16, 2016 at 7:47 AM, Damian Guy <damian....@gmail.com> wrote: > Then you'll have under-replicated partitions. However, even if you have 3 > brokers with a replication factor of 2 and you lose a single broker you'll > still likely have under-replicated partitions. > Partitions are assigned to brokers, 1 broker will be the leader and n > brokers will be followers. If any of the brokers with replicas of the > partition on it crash then you'll have under-replicated partitions. > > > On 16 February 2016 at 14:45, Sean Morris (semorris) <semor...@cisco.com> > wrote: > > > So if I have a replication factor of 2, but only 2 brokers, then > > replication works, but what if I lose one broker? > > > > Thanks, > > Sean > > > > On 2/16/16, 9:14 AM, "Damian Guy" <damian....@gmail.com> wrote: > > > > >Hi, > > > > > >You need to have at least replication factor brokers. > > >replication factor = 1 is no replication. > > > > > >HTH, > > >Damian > > > > > >On 16 February 2016 at 14:08, Sean Morris (semorris) < > semor...@cisco.com> > > >wrote: > > > > > >> Should your number of brokers be atleast one more then your > replication > > >> factor of your topic(s)? > > >> > > >> So if I have a replication factor of 2, I need atleast 3 brokers? > > >> > > >> Thanks, > > >> Sean > > >> > > >> > > > > > -- *Alex Loddengaard | **Solutions Architect | Confluent* *Download Apache Kafka and Confluent Platform: www.confluent.io/download <http://www.confluent.io/download>*
