#Migration

Posts about migration. ← All posts

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· Engineering

CDC for minimal-downtime Spanner migration — Datastream + Pub/Sub + Dataflow

A bulk migration takes hours; the application can't be offline that long. CDC keeps the source and destination in sync while the bulk runs, and a quick cutover swaps traffic. The handoff between bulk and CDC is where most migrations go wrong.

SpannerDatastreamPub/SubDataflowMigration
· Engineering

Workload Identity Federation Azure → GCP for a real migration

Moving a workload from Azure to GCP while it continues to authenticate against on-prem Azure AD (Entra ID). Federation lets the GCP workload assume a GCP service account based on its Azure identity.

AzureGCPWorkload Identity FederationMigration