🛑 Stop Sprinkling sync.Map Everywhere

“Magically thread-safe” sounds great — until your codebase is full of latency spikes, hidden races, and weird allocations.

Here’s what I’ve learned in practice:

1. ✅ Where sync.Map shines: feature flags, stable key sets, mostly reads.
2. ❌ Where it hurts: dynamic caches, active sessions, mutable values.
3. 🛠️ Better defaults:
4. Typed map + RWMutex
5. Sharded map for high contention
6. Copy-on-write for rare writes

Bottom line: sync.Map is a narrow tool. Use it only when keys are stable, writes are rare, and you measured the need.

Otherwise, a boring map with a lock is faster, safer, and saner.

👉 Full article: It’s Time to Rethink sync.Map https://medium.com/developersglobal/its-time-to-rethink-sync-map-c032eedf0a37