Designing the Spotify perimeter

Do not lean

In this blog post we focus on the web load balancers and various proxy systems across the Spotify perimeter. We go through the ways we expose our service network to the Internet and the challenges we faced while automating that. Team autonomy is a big part of the Spotify culture and in this blog post […]

Cassandra: Data-Driven Configuration

Spotify currently runs over 100 production-level Cassandra clusters. We use Cassandra across user-facing features, in our internal monitoring and analytics stack, paired with Storm for real-time processing, you name it. With scale come questions. “If I change my consistency level from ONE to QUORUM, how much performance am I sacrificing? What about a change to […]

Dealing with Java linking problems

Dependency Hell Most Java developers have probably run into problems where their code throws a NoSuchMethodError or a NoClassDefFoundError at runtime, despite compiling perfectly well. These issues can be very frustrating and hard to solve. This post tries to explain how they happen and explores some things that can be done to fix them. Why […]

Underflow bug

All of us are familiar with overflow bugs. However, sometimes you write code that counts on overflow. This is a story where overflow was supposed to happen but didn’t, hence the name underflow bug. Round-robin In our Java implementation of the round-robin algorithm, we store the number of connections in variable size and then we call index() % size to […]

Generating test cases so you don’t have to

In my spare time, I have developed a C++ framework for property based testing called RapidCheck. As my Hack Week project, I wanted to see if it could be a applied to the code I deal with at work: the Spotify player code. “But hey, aren’t there lots of C++ testing frameworks out there already” you […]

Switching user database on a running system

Introduction All Spotify users are now stored in a Cassandra database instead of Postgres. The final switch was made on May 11th, and we, the team responsible for user login at Spotify, would like to tell you a little bit about this endeavour. Ode to PostgreSQL In the past year Spotify has added more than […]

RAMLfications – Python package to parse RAML

A few of us at Spotify are infatuated with RAML – a RESTful API Modeling Language described as “a simple and succinct way of describing practically-RESTful APIs”, extremely similar goal of Swagger. I’m pleased to announce the initial release of RAMLfications, a Python package that parses RAML and validates it based on the specification into Python objects.

Introducing git-test

Git is an incredible tool, but it isn’t magical and it doesn’t think for you. When actually doing distributed version control, collaborating with people working at the same time, it’s easy to get some wires crossed. Git-test helps you keep the commits on your branch working.

Understanding the Spotify Web API

Six months ago, when we launched our Web API, we provided twelve endpoints through which developers could retrieve Spotify catalog data. Today the API has 40 distinct endpoints and more are being added all the time. In this post, I’d like to take you on a brief tour of the API and show you some […]