khepri
ra
khepri | ra | |
---|---|---|
3 | 7 | |
307 | 777 | |
3.6% | 0.4% | |
8.1 | 8.9 | |
30 days ago | 4 days ago | |
Erlang | Erlang | |
Apache License 2.0 | GNU General Public License v3.0 or later |
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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?
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"
What are some alternatives?
partisan - High-performance, high-scalability distributed computing for the BEAM.
lasp - Prototype implementation of Lasp in Erlang.
brod - Apache Kafka client library for Erlang/Elixir
MicroRaft - Feature-complete implementation of the Raft consensus algorithm in Java
observer_cli - Visualize Erlang/Elixir Nodes On The Command Line
asdf - Extendable version manager with support for Ruby, Node.js, Elixir, Erlang & more