I\'ve setup a AWS instance with cassandra on it and then also setup an auto scaling group to spin up another 4-8 instances depending on alarma. But how does Cassandra know w
Another issue with using auto scaling is that, there is no instant gratification. You cannot really see the benefit of the new node till the cluster rebalances, and this could take long depending on your cluster.
While rebalance is in-progress, you end up putting additional load on the original nodes, which would defeat the purpose of adding capacity.