async-lsm - an LSM library for Rust

All the existing Rust LSM's appear to be synchronous. This leads to a function colouring mismatch when using cloud blob storage, as (most) all client SDKs for such systems are async.

Currently, this is an experiment.

Goals

• Library for opening LSM storage on top of an Async storage abstraction
• Included storage implementations for local disk and common blob storage APIs
• Single process access to the storage - fencing and other distributed system concerns should be handled by the deployment layer of an application built on top of this library.
• Write-through caching
• Read caching
• Some sensible limits on value and key sizes
• Reads don't block writes
• Mutations don't block reads
• Mutations are serialised, but multiple mutations can be in flight at once