Cassandra (Overview)

Summary

A wide-column NoSQL database built for massive write throughput and multi-datacenter replication — used by companies operating at extreme scale (originally built at Facebook).

• 1Read a high-level overview of Cassandra's architecture — no master node, eventual consistency.
• 2Understand its trade-off: extreme write scalability in exchange for weaker consistency guarantees.
• 3Recognize this is a specialized tool — most projects will never need it.