Anatomy of a large migration
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
break a migration into reversible phases with measurable checkpoints.
Planned topics
- Phases: prepare, build new path, run in parallel, shift traffic, verify, decommission.
- Every phase has an entry check, a measurable exit check, and a rollback.
- Prefer many small reversible steps over one big cut-over.
- Name an owner for each phase and a single place that shows current status.
Draft outline details
Demonstration
Phase table: phase | change | exit measure | rollback. Example: shadow read | compare shipment status old vs new | mismatch rate below threshold | stop shadow, no user impact. This follows the extraction phases planned in SRB-008.
Check your understanding
What must every phase have?
Show answer
An exit measure and a rollback.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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