On Thu, Mar 24, 2011 at 11:58 PM, Jared Laprise <ja...@webonyx.com> wrote:
> My replication factor is 1 > Then you are living dangerously. > I haven't run repair until today, I'm using ONE for consistency level. > Repair at rf=1 won't do anything. I have two servers that are load balanced (per session) which both run > Cassandra and each server connects to Cassandra on localhost. > > Based on what you're saying, and being I'm using session (cookie) based > load balancing it would be true that data is rarely read or written (per > user) on a different server, that could be why data isn't replicating. > > Again, I'm extremely appreciative of your feedback as I haven't had the > luxury of delving into all aspects of Cassandra and especially related to > multi-node deployments. Thanks! Here is the key point: replication_factor refers to the total replicas (where replica means 'instance of the data', not 'copy of it'.) You only have one, which is why half your data disappeared when a node was down. I would go to 2 and then run repair (see http://wiki.apache.org/cassandra/FAQ#change_replication) so you have redundancy. -Brandon
