عرض عملي: قراءة ظلّية لحالة الشحنة من النظامين

خطوة بخطوة

1. Define the comparison key, fields to compare, and the mismatch threshold for cut-over.
2. Route a copy of read requests to the new path behind a flag; log both results.
3. Review the mismatch report by category after a day of traffic.
4. Planned mistake: treat a timing difference as a bug and chase it. Fix: classify expected differences (event delay) and compare after a settle window.
5. Fix a real mismatch (status mapping) and watch the rate fall below the threshold.
6. Record the decision: ready for 5% serving, with a rollback via flag.

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