I was reading "Cassandra The Definitive Guide" and page 46 has this to say about Replication Factor:
"The replication factor essentially allows you to decide how much you want to pay in performance to gain more consistency. That is, your consistency level for reading and writing data is based on the replication factor"
Now to me that's news. If replication is increased, it is kind of intuitive that it improves availability and depending on topology of the cluster its partition tolerance as well. However why does the author say that it increases consistency. I will think its quite the opposite. You have to take extra effort to ensure consistent state of your persistent data by propagating updates to every replica on different nodes. So more the replica, harder it is to maintain consistency. Why does the author say the exact opposite?
All inputs appreciated.