a. their on-call team was frequently paged for issues with the database, latency was unpredictable, and 2. Dual-write new data to both Cassandra and ScyllaDB while concurrently setting up ScyllaDB’s…

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gitconnected

Discord’s Cassandra cluster exhibited serious performance issues that required increasing amounts of effort to just maintain, not improve. In 2017, the Discord team ran 12 Cassandra nodes, storing billions of messages. They migrated their data to ScyllaDB because they were looking for a database that was scalable and fault-tolerant.

How Discord Stores Trillions of Messages — Curious Case of System Design

<p>tl;dr they wanted to solve cold&amp;hot disks problem which leads to idle replicas which leads to more cost.</p>
