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There was a paper published about facebooks infrastructure: https://www.usenix.org/system/files/atc23-huye.pdf

> Scale is measured in millions of instances: On 2022/12/21, the microservice topology contained 18,500 active services and over 12 million service instances.

They do go on to say that microservice as a concept is poorly defined. Are you suggesting that they mostly have 18500 of what we’d normally consider monoliths?




Probably some unit inside Meta. Most of Facebook backend was a deployed as a single unit.




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