Prime Day was a success by almost all accounts with over 100 million products sold, but there were overshadowing site issues as well.

Many users reported seeing the errors, including Amazon’s dog-filled error page, and thanks to CNBC we now have some insight as to why. According to internal documents, Amazon failed in having enough servers to handle all the customers. Within the first few minutes after things kicked off on 3 p.m. Eastern Time on July 16, many customers started seeing problems.

Per the report, an “auto-scaling” feature was supposed to kick in when demand from customers got too high. This didn’t happen, which resulted in teams at the company manually adding and deploying servers. CNBC notes that Amazon’s proprietary request server, Sable, which provides “computation and storage services,” was the primary cause of the breakdown. Read more…

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