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I don't really have a deep technical explanation blog post out, but we should definitely publish one.

I can say that your last paragraph is essentially correct though. It works exactly that way.

Is there anything on how a multi-node cluster works (I'm kinda assuming there's something since it makes "single" mentions a few times)? Application-level sharding is always an option (and multiple things I've worked on have used it to great effect), but anything automatic seems likely gnarly and fun to learn about, if it recovers some of the naive perf loss of "just hold the lock while doing rpc to other nodes".

I'm publishing a post this week about it.

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