I am beginner in Cassandra, I currently have 72 GBs of Data that is growing and i will have approximately 1gbs inserted into database daily. How can i decide number of nodes in the cluster and how often should i add new nodes, is there any way to automatically add new nodes(auto scaling) on EC2 when it is required.

I was thinking to have 3 nodes into cluster, but i am not sure if Casandra will divide data equally to 3 nodes by itself?

Is there any specific guide to deciding number of nodes and what should be the metrics to know when a node is needed to be added?

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