The Evernote engineering team posted a five part blog post [1] that goes deep on the detail of the migration and work to maintain consistency. TLDR: Shard at a

The Evernote engineering team posted a five part blog post [1] that goes deep on the detail of the migration and work to maintain consistency. TLDR: Shard at a time was replicated over the network, then live traffic was cut over to the Google Cloud replica. [1] https://blog.evernote.com/tech/2017/02/08/part-1-evernote-service-options-migrate-google-cloud-platform-gcp/ https://blog.evernote.com/tech/2017/02/08/part-1-evernote-se...