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A comment on Ask HN: How do big web sites roll out new versions?. Parent comment

Re:Ask HN: How do big web sites roll out new versions? by dcurtis on Saturday December 27, 2008 @07:50PM (#411556)
What is the magnitude of this, and how many servers do you have to buy to do the deployment?

Also, while the DNS is switching there would be some major database inconsistencies between the two server stacks. How do you deal with that?

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Re:Ask HN: How do big web sites roll out new versions? by seldo on Sunday December 28, 2008 @09:56PM (#412509)
The number of servers you have to buy is totally property-dependent. It can be anywhere from 2 to several hundred, but is usually less than 20 in total for the median-sized Yahoo property.

Could you clarify what you mean by database inconsistencies between stacks?

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