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The tool was initially developed as a Spotify Hack Week project, but it has since evolved into a robust load-testing tool that can send payloads to any internal Spotify service over multiple network protocols (HTTP and gRPC among them). Moshpit is Spotify’s internal Backstage plugin for load testing our backend services. So we need to properly load test and stress test our system to make sure our service, and the upstream services that it depends on, can stand the load. In the first three to four hours, when the experience goes live, we see some of the most demanding traffic of the campaign, on the order of tens of millions of users. Our main backend service, called “campaigns service,” sends personalized and localized data to the mobile clients to deliver Wrapped to millions of users. To this end, we’ve leveraged our internal tools to stress test our system with the scale of traffic that we will experience, particularly on day one of launch.

And at that time, our infrastructure for supporting that volume is put to the test. Millions of people, all over the world and across all time zones, start watching their data stories on-platform, typically at the same time in the morning of the launch. Last year, with more than 150 million unique engaged users across more than 111 markets, the Wrapped engineering team had the extraordinary challenge of supporting traffic across many regions and from different devices to ensure the Wrapped experience was a smooth one.Įach year, when Wrapped goes live, the Spotify team is faced with a “ thundering herd problem”.

Wrapped is Spotify’s global annual year-end campaign that celebrates our listeners with a personalized review of their listening habits over the past year.