Parallel Run & Versioned Migrations — Roadmap Step & Resources
Running old and new implementations side by side to validate correctness before full cutover
- Level: advanced
- Estimated time: 1 days
- Roadmap: System Architecture
Before this step
Interview questions
- How would you validate a rewritten pricing service before fully trusting it in production?
Study resources
- ParallelChange (Article) — Martin Fowler's own article on the parallel change technique for safe migrations.
- Parallel Run Migration Strategy Explained (Video) — Covers validating a rewritten component by running old and new side by side.
Part of
- Evolutionary Architecture & Migration Strategies — section
- System Architecture roadmap — the full learning path