Zero Downtime

Phase 1 is the safest phase of the migration — by design. No write operation touches the new microservices. Magento remains the source of truth for all data modifications. The only thing Phase 1 does is prove that your microservices can serve reads faster and more reliably than Magento. Answer-first: Phase 1 deploys Go microservices in read-only mode, routes GET requests to them via the API Gateway’s per-domain feature flags (with automatic fallback to Magento if the service is unhealthy), and uses Debezium — running in embedded engine mode without a standalone Kafka cluster — to stream Magento MySQL changes to the microservices via Dapr PubSub on Redis Streams. Writes continue to go to Magento. Data latency target: < 2 seconds. ...

Phase 3 is the final act: 100% of traffic moves to microservices, Magento becomes a passive archive, and the platform runs entirely on Go microservices via GitOps. No PHP in the critical path. No Magento license renewal needed. Answer-first: Customer and Catalog services cut over at 100% immediately (they’ve been stable through all of Phase 2). Order Service uses a graduated 25%→50%→75%→100% ramp over 10 days, with a monitoring hold at each step. Magento stays alive as a hot standby for 30 days — an archive-service syncs microservice data to Magento hourly (one-way, for regulatory compliance). All deployments use ArgoCD + Kustomize; a git commit triggers a production deployment within minutes. ...