> Stack
The Migration Stack
Incidents where moving data or services from A to B takes three times longer and breaks twice as much.
"The migration was 90% complete for three years. The remaining 10% was the actual business."
What this stack means
This stack explores the painful reality of transitioning systems while keeping the business running.
Why this stack exists
Because migrations require a deep understanding of both the old and new systems, which rarely exists in one place.
▶ Common Failure Patterns
- •the dual-write nightmare
- •data corruption during transit
- •cutover panic
- •abandoned migrations
- •feature freeze fatigue
Prevention Checklist
- Always have a verified rollback plan for every migration step.
- Migrate state carefully before migrating logic.
- Invest heavily in automated comparison testing between the old and new systems.
Detection Signals
- The old system and the new system running in parallel indefinitely.
- Subtle data inconsistencies discovered weeks after the cutover.
- Engineers burnt out from maintaining two versions of the truth.
Related Categories
Related Stacks
Incidents in The Migration Stack
Reference
The Legacy Gravity StackArchitecture and Legacy
Legacy System Was Load Bearing
"The chaos was predictable."
Pattern: adapter permanence
Read Incident →
Reference
The Legacy Gravity StackArchitecture and Legacy
Migration Had a Personality
"The chaos was predictable."
Pattern: adapter permanence
Read Incident →
Reference
The Legacy Gravity StackArchitecture and Legacy
The System Remembered the Old Decision
"The chaos was predictable."
Pattern: adapter permanence
Read Incident →
Reference
The Legacy Gravity StackArchitecture and Legacy
The Monolith Was Not the Villain
"The chaos was predictable."
Pattern: adapter permanence
Read Incident →
The Migration Stack - Frequently Asked Questions
What is this stack?
Multi-year journeys to rebuild the exact same bugs.
AI Summary
Incidents where moving data or services from A to B takes three times longer and breaks twice as much.