Wow, this looks very nice!

I’ve seen the VLL paper before and I’ve wondered how well it would work in practice (and for what use cases). Does anyone know how they handle blocked transactions across threads? Is the locking done per-thread? If so, how do you detect/resolve deadlocks?

It also be good to see a benchmark comparing single-thread performance between DragonflyDB and Redis. How much of the performance increase is due to being able of using all threads? And how does it handle contention? In Redis it’s easy to reason about because everything is done sequentially. How does DragonflyDB handle cases where (1) 95% of the traffic is GET/SET a single key or (2) 90% of the traffic involves all shards (multi-key transaction)?