Build a distributed NoSQL database with Apache Cassandra: 
Recently, I got a rush request to get a three-node Apache Cassandra cluster with a replication factor of two working for a development job. I had little idea what that meant but needed to figure it out quickly—a typical day in a sysadmin’s job.
Here’s how to set up a basic three-node Cassandra cluster from scratch with some extra bits for replication and future node expansion.
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