Charm - A charming little key-value store.

Charm is a distributed key-value store. It is built on top of the Raft consensus algorithm and is written in Rust.

Features

• Linearizable reads and writes
• Idempotent writes (exactly-once semantics)
• Fault-tolerant for up to n/2 - 1 failures
• Automated leader election, with requests forwarded to the leader

Upcoming Features

• Read-only optimization (Read Index)
• Snapshotting
• Joint consensus for cluster membership changes
• Multi-raft

Testing Roadmap

• Deterministic simulation
• Crash resilience
• Network partition resilience

API

Charm exposes a GRPC API for interacting with the cluster, available in proto/charm.proto.

Running a cluster

See the arguments in src/bin/charm.rs for the available options.