Architecture Digest

Aug 18, 2026 · Backend Development

How to Design a ThreadPool to Send 10 Million SMS in One Hour – Interview Insights

Sending 10 million marketing SMS within an hour forces careful thread‑pool design: avoid unbounded queues that cause OOM, choose a bounded ThreadPoolExecutor, dynamically tune core/max sizes, use CallerRunsPolicy for natural back‑pressure, and add persistence and compensation mechanisms to guarantee reliability.