This is an implementation of the Raft distributed consensus protocol. It's heavily influenced by benbjohnson's implementation. It focuses on providing a clean and usable API, and well-structured internals.
A node in a Raft network is represented by a Server structure. In a typical application, nodes will create a Server, and expose it to other nodes using a Peer interface.
Servers are only useful when they can communicate with other servers. This library includes a HTTP Transport (ingress) and HTTP Peer (egress) which combine to allow communication via REST-ish endpoints. For now, it's the simplest way to embed a Raft server in your application. See this complete example.
Several other transports are coming; see TODO, below.
The Raft protocol has no affordance for node discovery or "join/leave" semantics. Rather, the protocol assumes an ideal network configuration that's known a priori to nodes in the network, and describes a mechanism (called joint-consensus) to safely replicate that configuration.
My implementation of joint-consensus abides those fundamental assumptions. Nodes may be added or removed dynamically by requesting a SetConfiguration that describes a complete network topology.
Leader electiondoneLog replicationdoneBasic unit testsdoneHTTP transportdone- net/rpc transport
- Other transports?
Configuration changes (joint-consensus mode)done- Log compaction
- Robust demo application ☜ in progress
- Complex unit tests (one per scenario described in the paper)