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Reminds me a bit of Scylladb with the focus on 'shard per core'. I've considered using Scylla as a cache as well, might try this out instead.

ScyllaDB and Seastar was my insipration when I thought about the architecture for Dragonfly

DF also has a noval eviction algorithm that combines LRU and LFU which could be great for caching use cases.

Indeed, I have a use case that would benefit from that (theoretically). I'll have to dig into the papers.

We did not disclose the algo yet. Once I publish the doc in the repo, I will tweet about it. (soon)