I keep hearing that the minimum number of Cassandra nodes required to achieve Quorum consensus is 4 I wonder why not 3? In fact, many container deployments by default seem to deploy 4 nodes. Can anyone shine some light on this?
What happens if I have 3 nodes and replication factor of 3 and consistency level: quorum? I should be able to achieve quorum level consensus right. If Total node = 3, RF=2 and consistency level = Quorum. Then I understand the quorum level consensus is not possible because the number of replica nodes here are 2. This also brings up another question does number of replica nodes always have to be an odd number to achieve quorum level consensus? If so, what happens when a replica node goes down ? it would still serve the requests but the quorum level consensus is not possible? Thanks kant
