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This is the first post on the English side of hancic.site. Why another blog The Chinese blog at blog.hancic.site has been running for a while. Some of the topics — distributed systems, trading systems, and engineering practice — are interesting to a global audience too. So here we are: an English blog, written without a translation step. What to expect Systems engineering and architecture notes Trading systems and quant tooling Occasional tooling and self-hosting stories Comments Comments run on giscus, powered by GitHub Discussions — feel free to drop a note below! ...

Three machines in a rack are still three machines. They become a distributed system when they have to finish one job together, and that requirement is where the trouble starts. On a single machine you get three things for free. Every thread shares the same memory, so a write lands and everyone sees it. One clock puts every event in order. One lock protects the shared state. Move that job across a network and all three disappear. ...