Decomposing the GitLab backend database, Part 3: Challenges and surprises

Part 3 of a blog series discusses the intricate challenges and unexpected surprises encountered during GitLab's database migration. The complexities of taking GitLab.com offline involved shutting down various systems like Kubernetes pods and cron jobs, which proved to be complex due to GitLab's extensive infrastructure. Despite thorough rehearsals, unforeseen issues such as autovacuum processes on CI tables and unexpected database connections required real-time problem-solving. The migration also faced latency issues due to cascading replication, which increased the load on primary databases and required careful rebalancing of PGBouncer connections to avoid CPU saturation. Incremental adjustments were made to manage connection limits and ensure stability, with detailed analysis guiding each step. Despite these challenges, GitLab successfully achieved its objectives, enhancing scalability without affecting developer productivity, thanks to the abstraction provided by Rails models. The blog emphasizes GitLab's commitment to transparency and invites further engagement from readers to explore the project's detailed documentation.

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