yujungin.com https://yujungin.com A personal journal by Jungin on software, with frequent detours into math and physics. en Designing a write-ahead log that survives power loss https://yujungin.com/posts/wal-survives-power-loss https://yujungin.com/posts/wal-survives-power-loss Systems Sun, 14 Jun 2026 00:00:00 GMT A practical walk through fsync semantics, group commit, and why your "durable" database might be lying about what made it to disk. Zero-copy parsing without losing your mind https://yujungin.com/posts/zero-copy-parsing https://yujungin.com/posts/zero-copy-parsing Rust Thu, 28 May 2026 00:00:00 GMT Lifetimes get a bad reputation. Borrowing slices of an input buffer can make a parser both faster and clearer. A field guide to consensus, minus the math anxiety https://yujungin.com/posts/field-guide-to-consensus https://yujungin.com/posts/field-guide-to-consensus Distributed Sat, 09 May 2026 00:00:00 GMT Raft, Paxos, and the handful of ideas that actually matter when a cluster needs to agree on a single number. The render loop is a state machine in disguise https://yujungin.com/posts/render-loop-state-machine https://yujungin.com/posts/render-loop-state-machine Frontend Tue, 21 Apr 2026 00:00:00 GMT Rethinking component updates as transitions instead of mutations made a tangled UI suddenly tractable. I rewrote my dotfiles and learned to stop tinkering https://yujungin.com/posts/stop-tinkering-dotfiles https://yujungin.com/posts/stop-tinkering-dotfiles Tooling Mon, 30 Mar 2026 00:00:00 GMT On the diminishing returns of configuration, and the surprising calm of a setup you no longer touch.