Concurrency Barrier Pattern in Go

Description

🚀 One of the most powerful patterns in microservices engineering — and most engineers don't know its name. The Barrier Pattern in Go is how you safely fan-out to multiple services concurrently and collect ALL results before proceeding. No partial data. No silent failures. Just clean, concurrent, production-grade aggregation. In this video, we build a complete HTTP GET aggregator using Go's Barrier Pattern: ✅ Fan-out to N endpoints concurrently using goroutines ✅ Buffered channels as the barrier mechanism — and why the buffer size matters for correctness ✅ All-or-nothing error semantics — if any endpoint fails, we report all failures ✅ Configurable timeouts with injectable package variables for clean testing ✅ Three critical test scenarios: success, partial failure, and timeout ✅ Production extensions: context propagation, structured logging, metrics hooks