Scaling Nextdoor’s Datastores

Nextdoor took on database scalability like a pro. They dynamically routed queries to read replicas and kept cache consistency tight, even while yanking the carpet out with schema changes. Multi JOINs blocked their move to distributed SQL like annoying roadblocks. But Nextdoor, the sly foxes, extended their lead by slicing off foreign-key shackles and outsmarting query routing. They bought precious time before slamming into the monolithic database ceiling.