Part 2- Strangler Fig Pattern Implementation

Short summary

A detailed walkthrough of the Strangler Fig pattern for extracting an Orders service from a monolith using CDC (Change Data Capture) via Debezium and Kafka. It explains why application-level dual writes fail (no cross-DB atomicity) and how CDC preserves commit ordering while enabling backfill plus streaming in one pipeline. The article covers shadow reads for validation, reconciliation jobs, lag monitoring, and the write-cutover phase using a facade/router with reverse sync back to the monolith.

• •Use CDC via Debezium/Kafka instead of dual writes to sync monolith and microservice DBs
• •Validate with shadow reads, reconciliation jobs, and lag monitoring before cutover
• •Write cutover uses a facade layer with reverse sync until all monolith consumers are migrated

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