Scale it to Billions — What They Don’t Tell you in the Cassandra README

At Threat Stack our engineering and operations teams have embraced the concept of the polyglot data platform, recognizing that no one solution can provide for all of our needs. Those needs include rapid scaling, ideally linearly, to support growing customer demand and the elastic workloads of our new economy customers. We also require different forms of analysis to support stream analysis for our IDS feature set, efficient lookup tables and prematerialized views for our ETDR feature set, and offline analysis for analysis and research.

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https://blog.threatstack.com/scaling-cassandra-lessons-learned