this post was submitted on 09 Jul 2023
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That isn't so much a question of the language. Horizontal scalability is a property of the system you are building. You need to engineer the communication between the individual nodes, you need to make choices on the CAP tryingle (https://en.wikipedia.org/wiki/CAP_theorem) and more.
So rust is already horizontally scalable, it's just hard to build horizontally, in any language.
(Sidenote, there is the language Erlang which seems to do a lot of this under the hood, but I have no experience with it so...)