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also-cache

A highly available replicated in-memory cache with high hit rates in Rust.

WIP. Right now only local cache is implemented, without the distributed part.

This cache is designed for scenarios where you want consistency and high hit rates across your distributed cluster. Rather than having each node maintain its own isolated cache, all nodes share cache updates with one another, ensuring that popular data is available throughout the entire cluster. This means that cache will have (mostly) the same latency everywhere.

Features:

  • (WIP) Peer-to-peer cache
  • Highly available
  • High hit rates (distributed S3-FIFO eviction strategy)
  • (WIP) Fast cache recovery after node startup
  • (WIP) TTL for cache entries

Main goals:

Getting started

  • examples directory of this repo
  • benches performance benchmarks (run with cargo bench).

Implementation

Currently each cache entry is stored as raw bytes on the heap. It might be a performance concern because of many allocations and heap fragmentation.

References

The implementation is heavily inspired by:

  • quick_cache. Low-overhead in-memory cache in Rust.
  • hiqlite. Embeddable replicated SQLite, implements Raft consensus algorithm which guarantees strong consistency.