Richard Carlsson

Author of Eunit and other tools, co-author of Erlang and OTP in Action

Richard Carlsson has been deeply involved with Erlang since the mid-nineties. He was one of the original members of the High-Performance Erlang group at Uppsala University and has contributed to many parts of the standard libraries, the Erlang compiler, runtime system, and the language itself.

Among other things, he is the author of Erlang's 'EDoc' documentation system and the 'EUnit' unit testing framework, and he is one of the authors of the book Erlang and OTP in Action. He has been working for Klarna for the last 10 years.


Past Activities

Richard Carlsson
Code BEAM SF 2019
28 Feb 2019
10.45 - 11.30

The art of the live upgrade - lessons from 10 years of evolving a live system

Klarna's main payment system has been running for over 10 years, serving millions of customers. The system has continuously evolved through live upgrades multiple times per week, without stopping nodes except for OS patching, Erlang VM upgrades, or hardware changes.

This talk will be about techniques, tools, mindset, and lessons learned during a decade of dynamic code loading.


Teaching practicioners about dynamic code loading techniques, tools, mindset, and war stories from a system that's been running for a decade.


Everyone running the Erlang VM in a live system.