Coexistence of old and new
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
design how old and new systems work together during migration.
Planned topics
- Decide for each data set which system is the master at each stage; never two masters.
- Routing: a facade or gateway sends traffic by capability, store, or customer group.
- Synchronization: events or CDC between old and new, with conflict rules.
- Coexistence has a cost and an end date; plan decommissioning of bridges.
Draft outline details
Demonstration
a diagram: customers, gateway, old shop and new platform, a sync service, ERP at the back; a table of "master by phase".
Check your understanding
What is the biggest coexistence risk?
Show answer
Two systems both changing the same data, with no single master.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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