Adding Redis to the backend to offload the database is a classic solution. Everything runs fast — until the exact moment a popular key's TTL expires, and the system runs into a non‑obvious trap: the very tool meant to speed things up becomes the trigger for a crash (Cache Stampede). Let's break down this chain reaction.
Taxi is one of the most popular services today: it’s quick, comfortable, door-to-door, and the rides cost is recently quite fair. Where there’s demand, there’s supply, and the rivalry among the companies offering taxi services is very tough. One needs to have an obvious advantage over the competitors to attract and keep clients. Our customer placed his bets on the modern software, dedicated to taxi companies in the first place and harnessing the most advanced technologies for them.
