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Software As If It Matters

David Dossot

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Top Stories by David Dossot

Call Me Never (Ignite Talk) I've been super honored to give an ignite talk during DevOps Days Vancouver 2014. Ignite talks are intense, as the slides mercilessly fly-by every 15 seconds, and this for 5 minutes sharp (yes, that's just 20 slides!). In this talk, I tried to present some of the lessons we've learned at Unbounce while rebuilding our page serving infrastructure. Our availability target is five-nines (that's an allowance of 6 seconds of downtime per week) so we've put lots of effort into building a stable, self-healing, gracefully-degrading piece of software. We had a few close calls though, hence the lessons learned shared in this talk. I was initially planning to cover this subject in a 30 minutes talk and had gathered tons of material to go in-depth, so delivering this material in 5 minutes was an interesting challenge! It was good actually, as it forced... (more)

ESB Testing Strategies with Mule

To be able to do anything useful, an ESB must be configured with all sorts of parameters, from endpoint connection URIs to message transformation scripts to content-based routing definitions. Moreover, ESBs like Mule can host custom components, which will process messages and perform user-specific actions on them. Deploying a new version of an ESB configuration raises the question of whether it will break anything. How can we build confidence that everything will be just fine? If unit testing did it for standard software development, what can it do in the realm of the ESB? Since... (more)

More than a language

Nearly 300 high-level programming languages have been developed during the last decade.One can only nod when reading this quote: indeed there's hardly a month without a new language being announced. The fun part is that it's the opening sentence of "A Guide to PL/I", printed in 1969! Clearly the programming community has always been prolific when it comes to spawning languages. And this trend makes sense: the tension between the need for general programming languages, which can deal with any type of problems, and the desire for specific programming languages, which best accommoda... (more)

The Holy Grail of Persistence?

One of the very first CTO-grade decision I had to take in the making of Snoget was to pick what would become our main transactional persistence engine. Since we're using Erlang exclusively for our production servers, the solution seemed easy: use Mnesia. But I settled for PostgreSQL. At this point, anyone who's been dealing with O/R mapping (like Ted Neward who said: "Object/relational mapping is the Vietnam of Computer Science"), should cry fool: Mnesia would offer me persistence without any impedence mismatch with the application runtime environment and I preferred a SQL databa... (more)

CRaSH for Mule, an Introduction

This blog is the formal introduction to the CRaSH console for Mule on which I've been working for the past month or so. I've decided to interview myself about it because, hey, if I don't do it, who will? What is CRaSH for Mule? It is a shell that is running embedded in Mule and that gives command-line access to a variety of Mule internal moving parts. It's built thanks to the excellent CRaSH project, a toolkit built by Julien Viet and sponsored by eXo Platform, which allows the easy creation of embedded shells. What can we do with it? Well, it's easy to find it out. Let's connect ... (more)