Evolution of the Runtastic Backend

" summary

Story of moving from two monoliths sharing one MySQL table to a microservice ecosystem that actually works with real tools and numbers: MySQL → Percona performance patches → Cassandra migration runs six months while fallback HTTP reads old data → MongoDB for large sport activity storage → RabbitMQ for event fan‑out → Docker + OpenShift for unified deploys. 150,000 new downloads per day forces pragmatic trades, a live‑tracking feature uses 16 RAM‑only Percona shards, and a datacenter move completes in a week by shipping machines.

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