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etcd is a distributed reliable key-value store for the most critical data of a distributed system, with a focus on being:

TiKV is an open-source, distributed, and transactional key-value database. Unlike other traditional NoSQL systems, TiKV not only provides classical key-value APIs, but also transactional APIs with ACID compliance.

The lightweight, fault-tolerant database built on SQLite. Designed to keep your data highly available with minimal effort.

A distributed, fast open-source graph database featuring horizontal scalability and high availability

open source training courses about distributed database and distributed systems