When plans meet reality
Black Friday got off to a great start. Nelly.com launched new deals every hour, keeping the interest levels spiked. However, there were some operational disruptions in the morning. The cause of the problem was difficult to identify at first. They figured out that the memcache memory reached its limit, even though an expansion was put in place in October. “Even with the thorough load tests, it’s difficult to anticipate shopping behaviors. It also taught us that new deals every hour create extreme peaks in visitor numbers.” says Henrik Palmqvist, CTO at Nelly.
Basefarm quickly added two extra memcache servers. Within 40 minutes of detecting the issue, Nelly.com was stable again. To be on the safe side, two additional servers were added before lunch.
The situation was under control for the rest of day.