Tag

#concurrency

3 articles

War Stories • May 3, 2026 • 13 min read

The Customer Support Ticket That Taught Me to Profile Before Designing

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.

concurrency Redis

War Stories • May 1, 2026 • 14 min read

When the Backend Spoiled the Animation

A UX complaint led me to one of the most underrated primitives in the Kafka client — consumer.pause(). Here's how a 2-second delay problem ruled out three reasonable approaches and ended up at a pause/resume pattern with a TaskScheduler.

Kafka Spring Boot

Highload • March 11, 2024 • 5 min read

Virtual Threads in Practice — After Two Years in Production

What actually happens when you flip the virtual threads switch on a Spring Boot service — the wins, the sharp edges, and when the old thread-pool model still beats them.

virtual threads java