Demo: catching a dual-write inconsistency in production data
On This Lesson 3 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
detect and repair drift caused by a dual write.
Draft outline details
Step by step
- Run a reconciliation query comparing the monolith and the new store.
- Find the mismatched shipments and classify causes (timeout, ordering, retry).
- Repair using the system of record as the source.
- Planned mistake: patch rows in both systems manually; fix by repairing from the owner and automating the check.
- Replace the dual write with an outbox and add a drift metric.
Prepares SRB-008-LAB1.
Practice
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