Ask HN: Free and open source distributed database written in C++ or C

This page summarizes the projects mentioned and recommended in the original post on

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  • ydb

    YDB is an open source Distributed SQL Database that combines high availability and scalability with strong consistency and ACID transactions

  • yugabyte-db

    YugabyteDB - the cloud native distributed SQL database for mission-critical applications. - Postgres fronted distributed OLTP database

    I work there (300+ ppl). It's primarily open source. It makes money through support contracts and cloud hosting, but all core development is done in the open.

  • Mergify

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  • Scylla

    NoSQL data store using the seastar framework, compatible with Apache Cassandra

    Never used it before but check out

    I have a lot of experience with Cassandra though.

  • dqlite

    Embeddable, replicated and fault tolerant SQL engine.

  • scaliendb

    ScalienDB is a scalable, replicated datastore.

  • ClickHouse

    ClickHouse® is a free analytics DBMS for big data

  • redpanda

    Redpanda is a streaming data platform for developers. Kafka API compatible. 10x faster. No ZooKeeper. No JVM!

    Went searching for and couldn't find it in the DB, fyi :)

    Not affiliated, just saw the Jepsen report posted here a few weeks ago.

  • InfluxDB

    Collect and Analyze Billions of Data Points in Real Time. Manage all types of time series data in a single, purpose-built database. Run at any scale in any environment in the cloud, on-premises, or at the edge.

  • rupy

    HTTP App. Server and JSON DB - Shared Parallel (Atomic) & Distributed

    I have one in Java:

    Here is the 2000 lines of code of the entire database:

    And here you can try it out:

  • Aerospike

    Aerospike Database Server – flash-optimized, in-memory, nosql database

    Scylla's main competitor in replacing C* with native code.

  • MySQL

    MySQL Server, the world's most popular open source database, and MySQL Cluster, a real-time, open source transactional database.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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