Top 5 Erlang Database Projects

CouchDB

27 6,009 9.5 Erlang

Seamless multi-master syncing database with an intuitive HTTP/JSON API, designed for reliability

Project mention: Why SQLite is so great for the edge | news.ycombinator.com | 2023-06-06
khepri

3 300 8.2 Erlang

Khepri is a tree-like replicated on-disk database library for Erlang and Elixir. (by rabbitmq)

Project mention: The Erlang Runtime System | news.ycombinator.com | 2024-02-14

Erlang/OTP doesn't handle leader election, and by itself is bad at handling netsplits.
There is https://github.com/rabbitmq/ra which is a Raft implementation in Erlang that is Jepsen-tested. You could use it to build "etcd in Erlang", or https://github.com/rabbitmq/khepri which is built on top of Ra.
WorkOS

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vaxine

2 109 10.0 Erlang

Rich-CRDT database based on AntidoteDB.

Project mention: Show HN: ElectricSQL, Postgres to SQLite active-active sync for local-first apps | news.ycombinator.com | 2023-09-20

Hi HN, James, Valter, Sam and the team from ElectricSQL here.
We're really excited to be sharing ElectricSQL with you today. It's an open source, local-first sync layer that can be used to build reactive, realtime, offline-capable apps directly on Postgres with two way active-active sync to SQLite (including with WASM in the browser).
Electric comprises a sync layer (built with Elixir) placed in front of your Postgres database and a type safe client that allows you to bidirectionally sync data from your Postgres to local SQLite databases. This sync is CRDT-based, resilient to conflicting edits from multiple nodes at the same time, and works after being offline for extended periods.
Some good links to get started:
- website: https://electric-sql.com
- docs: https://electric-sql.com/docs
- code: https://github.com/electric-sql/electric
- introducing post: https://electric-sql.com/blog/2023/09/20/introducing-electri...
You can also see some demo applications:
- Linear clone: https://linear-lite.electric-sql.com
- Realtime demo: https://electric-sql.com/docs/intro/multi-user
- Conflict-free offline: https://electric-sql.com/docs/intro/offline
The Electric team actually includes two of the inventors of CRDTs, Marc Shapiro and Nuno Preguiça, and a number of their collaborators who've pioneered a lot of tech underpinning local-first software. We are privileged to be building on their research and delighted to be surfacing so much work in a product you can now try out.
verkle

4 17 6.7 Erlang

A database being built for the Amoveo blockchain.
cets

1 11 9.4 Erlang

A library to synchronise records from the ETS tables between nodes

Project mention: Ask HN: Good examples of fault-tolerant Erlang code? | news.ycombinator.com | 2023-12-28

Making cluster fault tolerant is an art on its own in Erlang ;)
Riak Core is extremely cool, but Riak is dead by now. It was a child of the times when NoSQL was cool. Still, basho code is interesting to read. (https://github.com/basho/riak_core)
Self-ads: we've tried to remove Mnesia from our project, HN post incoming, once the library is prettified and tested hard (https://github.com/esl/cets).
InfluxDB

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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2024-02-14.