How One Synchronous Function Can Kill 10,000 Users скачать в хорошем качестве

How One Synchronous Function Can Kill 10,000 Users

A single synchronous function brought down a high-traffic Node.js payment API and affected 10,000 concurrent users — without crashing the service, without failing health checks, and without obvious infrastructure issues. In this video, we break down a real production failure caused by one innocent-looking line of synchronous JavaScript and explain exactly how it froze the Node.js event loop, triggered cascading retries, and caused a full outage. You’ll learn: How synchronous JavaScript blocks the Node.js event loop Why JSON.parse on large payloads is dangerous in production What actually happens inside V8 when the main thread is blocked Why CPU-bound work affects all users, not just one request How event loop lag reveals hidden outages The difference between concurrency and parallelism in Node.js How one slow request can cascade into system-wide failure Production-safe patterns using async APIs, worker threads, and chunking This is not a beginner tutorial. It’s a production mental model every Node.js backend engineer needs to internalize before the incident happens. If you build high-traffic APIs, payment systems, or latency-sensitive services, this lesson can save you from your next outage.