SuperMassive

What SuperMassive is

SuperMassive is a free, open-source distributed key-value database for in-memory operations, durability, and low latency. It runs self-hosted on Linux, macOS, or Windows, with binaries or source builds available, and uses the BSD-3-Clause license. Data is spread across shards, and adding nodes supports horizontal scaling. Writes are distributed among primary nodes in sequence-based round-robin order; reads run in parallel across primaries and, when needed, replicas. The project describes automatic failover and self-healing after node failures. Timestamp-based version control resolves conflicts by returning the most recent value. Nodes record operations in journals, and replicas can synchronize missing entries from their primary. Commands include PUT, GET, DEL, INCR, DECR, REGX, STAT, RCNF, and PING. Client authentication uses usernames and passwords; node communication uses shared keys, with optional TLS. The repository README says the system has no transactions and only one user. Its GitHub repository is marked archived and read-only as of May 6, 2026.