17. Short Q&A Prompts (Practice)

Targeted prompts to practice depth, clarity, and trade‑offs under time pressure.

• When should you use context.WithTimeout vs server timeouts?
• Explain backpressure with buffered channels.
• How does sync.Once establish happens‑before?
• What changed in Go 1.22 loop variable semantics?
• How do you prevent goroutine leaks in streaming HTTP handlers?
• When to prefer http.NewServeMux over frameworks?
• How to tune DB pool settings for spiky traffic?
• When is sync.Map preferable to map+mutex?
• How do you design idempotent retries with backoff and jitter?
• How do you add correlation IDs to logs and traces?