The Error Model. I’ve been doing a lot of resiliency related things lately and that means dealing with errors. This post is one of the longest (and also best) summary of error handling on the planet. Write code that is easy to delete,

Fail at Scale Great post about failure at Facebook. My favorite parts were controlled delay and adaptive LIFO. These two data points seem to suggest that when Facebook employees are not actively making changes to infrastructure because they are busy with other things (weekends,

Previously. QuotesThe true purpose of testing, just like the true purpose of design, is to reduce costs.Sandi Metz in Practical Object-Oriented Design in Ruby. MotivationalWant to Create Things That Matter? Be Lazy. Love the splitting of work into two categories: deep and shallow.

Previously. ResiliencyResiliency checklist A fantastic checklist broken up into 4 categories: fault tolerance, scalability, operability and efficiency. What happens when a dependency starts failing? What if it begins failing slowly? How can the system shed load? What is the chief metric with which the

Previously. DataBuilding DistributedLog: Twitter’s high-performance replicated log service How Twitter build a distributed log on top of Apache BookKeeper. Great post on the features they required and the results. In this section we describe DistributedLog, a serving layer that we built on top

I read a lot. I curate what I read into likes in instapaper and bookmarks in pinboard. It hit me the other day, as I was reading one of the many email newsletters I subscribe to for dev tips, that there is value in