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When upgrades go bad

One of the cardinal rules of running a large scale Internet business is that you want to have a production network and an R&D network that are independent.  You test on the R&D network, then push it out for production.  Every once in a while you have to roll back the updates due to errors, but that should not happen very often or at all.  I guess Facebook didn't get this memo.  Maybe I should write something on their Wall.

 

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