ydb

YDB is a distributed SQL database built to scale to thousands of nodes without giving up strong consistency or ACID transactions. It handles both transactional and analytical workloads, speaks PostgreSQL and Kafka wire protocols, and scales storage and compute independently. Apache 2.0, open sourced by Yandex, where it runs systems at very large scale.

Running YDB yourself is a serious commitment. It is a true distributed system: you deploy a cluster across availability zones, manage storage nodes separately from compute, and own the upgrades and monitoring. Ansible and Kubernetes paths exist, but this is heavy infrastructure. A single-node dev setup is easy. A fault-tolerant production cluster is not a side project.

If you genuinely need Spanner-style horizontal scale with strong consistency, YDB is a credible open alternative to CockroachDB or Google Spanner. Most teams do not need this. Solo and small teams are far better served by plain Postgres. Reach for YDB when a single Postgres box truly cannot hold your write volume and you have people who can run distributed storage.

The catch is the ecosystem and the origin. Tooling, community, and third-party integrations are thinner than the mainstream databases, and the project's center of gravity is Yandex. The PostgreSQL compatibility helps, but you are betting on a smaller ecosystem to save yourself from a scaling wall most apps never hit.