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A comment on Introducing Cloud Spanner, a Global Database Service. Parent comment
Everything you need to know is here: https://research.google.com/pubs/pub38125.html
it walks through the architecture of the Ads DB, the issues with replacing MySQL, and some of the heroic efforts to implement it via Spanner.
At the time, I asked the team why they used MySQL instead of Postgres (which I prefer) and the short answer was: MySQL replication worked at the time.
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Everything you need to know is here: https://research.google.com/pubs/pub38125.html
it walks through the architecture of the Ads DB, the issues with replacing MySQL, and some of the heroic efforts to implement it via Spanner.
At the time, I asked the team why they used MySQL instead of Postgres (which I prefer) and the short answer was: MySQL replication worked at the time.