My team was migrating 1000+ VMs from aws to gcp, mostly for cost efficiency (and adoption of k8s for even better cost) We used kafka mirrormaker 1, with 2 ways

My team was migrating 1000+ VMs from aws to gcp, mostly for cost efficiency (and adoption of k8s for even better cost) We used kafka mirrormaker 1, with 2 ways sync (new cluster have separate topics for write that are synced to old cluster, and all topics from old cluster synced to new cluster) For postgres failover switch to new master required about 1-2 minutes of downtime We migrated ~80 microservices within 8 months and now our infra cost about 1/4 of what we paid to aws, completely worth the effort!