Covers: - The quorum formula (floor(N/2) + 1) - Why W + R > N guarantees consistency - Real examples from Cassandra, ZooKeeper, etcd - How quorum prevents split

Covers: - The quorum formula (floor(N/2) + 1) - Why W + R > N guarantees consistency - Real examples from Cassandra, ZooKeeper, etcd - How quorum prevents split-brain during network partitions - The tradeoffs between read and write quorums