ra
khepri
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| ra | khepri | |
|---|---|---|
| 7 | 3 | |
| 777 | 304 | |
| 1.3% | 3.6% | |
| 8.9 | 8.1 | |
| 5 days ago | 19 days ago | |
| Erlang | Erlang | |
| GNU General Public License v3.0 or later | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
ra
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The Erlang Runtime System
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.
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Ask HN: Good examples of fault-tolerant Erlang code?
Just to add to this, there are some implementations of things like consensus algorithms in Erlang such as Ra: https://github.com/rabbitmq/ra
- Elixir at Ramp
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An Animated Introduction to Elixir
You may find these interesting...
- "The Onion Layer Theory" https://learnyousomeerlang.com/building-applications-with-ot...
- "On Erlang, State and Crashes" http://jlouisramblings.blogspot.com/2010/11/on-erlang-state-...
- "Why Restarting Works" https://ferd.ca/the-zen-of-erlang.html (search for "Heisenbug")
> you should store the state in the external system
Disk works too, but if you're multi-node this means you now have a distributed database embedded in your system, which may or may not be your goal :)
RabbitMQ does this, they developed a library for "persistent, fault-tolerant and replicated state machines" based on Raft: https://github.com/rabbitmq/ra.
- Question about a Decentralized Timeline
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Building Aggregates in Elixir and PostgreSQL
Here is link number 1 - Previous text "Ra"
khepri
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The Erlang Runtime System
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.
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Khepri is a tree-like replicated on-disk database library for Erlang and Elixir
https://rabbitmq.github.io/khepri/ has a bit more information on why you might want to use this, from what I can understand. It's a bit over my head. I guess its sort of simpler to manage a bunch of data on a disk vs a regular db (when not considering that just a bunch of data on disk), mostly around network issues?
What are some alternatives?
lasp - Prototype implementation of Lasp in Erlang.
partisan - High-performance, high-scalability distributed computing for the BEAM.
MicroRaft - Feature-complete implementation of the Raft consensus algorithm in Java
brod - Apache Kafka client library for Erlang/Elixir
asdf - Extendable version manager with support for Ruby, Node.js, Elixir, Erlang & more
observer_cli - Visualize Erlang/Elixir Nodes On The Command Line
Atomix - A Kubernetes toolkit for building distributed applications using cloud native principles
Binbo - Chess representation written in Erlang using Bitboards, ready for use on game servers
buffstreams - A library to simplify writing applications using TCP sockets to stream protobuff messages
vernemq - A distributed MQTT message broker based on Erlang/OTP. Built for high quality & Industrial use cases. The VerneMQ mission is active & the project maintained. Thank you for your support!
fasthttp - Fast HTTP package for Go. Tuned for high performance. Zero memory allocations in hot paths. Up to 10x faster than net/http
CouchDB - Seamless multi-master syncing database with an intuitive HTTP/JSON API, designed for reliability