NoSQL Concurrency Issues: The Hidden Danger of Read-Modify-Write Operations.

Part 1 of 3 — the single-document case. There's a class of bug that every backend engineer ships at least once, usually Take a concrete invariant: a team can hold at most 10 seats. To add a seat you count < 10, and write. A textbook Read → Modify → Write. Now run it twice at the same instant. Reques