Tag
A "simple" lost-update bug took me through optimistic locking, pessimistic locking, and finally a two-stage Redis-locked aggregator — a tour of why the right concurrency primitive depends entirely on the shape of your contention.
A routine scale-up from one pod to three exposed an architectural assumption I'd been making for years — that Spring's in-memory STOMP broker could survive horizontal scaling. It can't. Here's the Redis Pub/Sub fan-out pattern that fixed it.
Cache-aside, write-through, read-through, and the stampede protection that separates a cache from a foot-gun. With concrete Java examples.
Token bucket, leaky bucket, sliding window — what each actually does, and the practical implementation in distributed systems.