Articles tagged with
devops

31 Aug 2018

Postmortem — why Allegro went down

We messed up. On July 18th, 2018, at noon, Allegro went down and was unavailable for twenty minutes. The direct cause was a special offer in which one hundred Honor 7C phones whose regular price is around PLN 850 (about € 200), were offered at a price of PLN 1 (less than € 1). This attracted more traffic than we anticipated and at the same time triggered a configuration error in the way services are scaled out. This caused the site to go down despite there being plenty of CPUs, RAM, and network capacity available in our data centers.

michal.kosmulski
06 Feb 2015

High performance with low-level tools

Even though a lot of software development is high-level stuff which does not require the developer to delve into the details of how things work under the hood, in certain situations it can be very helpful to know what sort of low-level operations an application is performing. Two typical scenarios are performance tuning and debugging.

michal.kosmulski