AWS to GCP Database Migration: Zero-Downtime Pipeline Guide

Migrating high-throughput relational databases between AWS Aurora and Google Cloud Spanner requires careful planning around replication lag, connection pooling, and schema transformations.

Technical Prerequisites

Before initiating the CDC (Change Data Capture) pipeline, ensure the following infrastructure conditions are met:

1. Network Connectivity: Dedicated AWS Direct Connect and GCP Cloud Interconnect endpoints to minimize network jitter.
2. Schema Compatibility: Auto-mapping PostgreSQL extensions across cloud provider dialects.
3. Buffer Management: Provisioning Kafka topics to absorb write spikes during snapshot synchronization.