Designing Safe Parallelism in Rails

February 12, 2026

Eliminating Connection Pool Exhaustion in Production

At Kaigi on Rails 2025 , 片田 恭平 (@katakyo) delivered a deeply practical talk titled:

“もう並列実行は怖くない — コネクション枯渇解消のための実践的アプローチ” (“Parallel Execution Is No Longer Scary — A Practical Approach to Eliminating Connection Pool Exhaustion”) もう並列実行は怖くない__コネクション枯渇解消のための実践的ア…

This session explored a real-world scaling problem inside a production Rails system and walked through the technical, architectural, and operational lessons learned while introducing parallel processing safely.

This article distills the core technical insights from that presentation, with explicit reference to the production context and the design constraints discussed at the conference.

👉 Read the full article.

https://rubystacknews.com/2026/02/12/designing-safe-parallelism-in-rails/