Facebook’s Database Handling Billions of Messages

Cassandra is a powerful distributed database system created by Facebook to manage and store massive volumes of data across many computers. Designed to support features like Facebook's Inbox Search for billions of messages, Cassandra is highly scalable, fault-tolerant, and ensures high availability even if some nodes fail. It is derived from Amazon Dynamo and Google Bigtable, combining their best features to overcome scalability issues faced by traditional databases like MySQL. Key features include distributed storage, no single point of failure, and efficient data handling through commit logs, memtables, and SSTables. Its architecture uses a peer-to-peer model and the gossip protocol for efficient node communication.