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This has been recognized for a long time.
Those change-over things are really severe. Really severe problems. - Joseph Henry Condon, Bell Labs ... via https://github.com/globalcitizen/taoup
However, we have much better tools now, such as high availability clustering, distributed architectures, middleware proxies, protocol-level support for temporary failures and retries, mature caching systems and fault tolerant hardware and software infrastructure. So it's practically not as hard as it once was, because if you've got your ducks in a row you can use a proven method or get fallbacks for free.
Check out GitHub scientist if you are doing a migration with a ruby based system: https://github.com/github/scientist
Great support and functionality for testing differences between two systems of record.