Amazon MemoryDB for Redis is a database service designed for 11 9s of durability with in-memory performance. In this paper, we describe the architecture of MemoryDB and how we leverage open-source Redis, a popular data structure store, to build an enterprise-grade cloud database. MemoryDB offloads durability concerns to a separate low-latency, durable transaction log service, allowing us to scale performance, availability, and durability independently from the in-memory execution engine. We describe how, using this architecture, we are able to remain fully compatible with Redis, while providing single-digit millisecond write and microsecond-scale read latencies, strong consistency, and high availability. MemoryDB launched in 2021.
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Taleb et al. (2024) studied this question.
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