HOW REDDIT BUILT A METADATA STORE THAT HANDLES 100K READS PER SECOND

Summary from the TLDR Web Dev newsletter

Reddit built a unified metadata store using AWS Aurora Postgres to handle over 100k reads per second for its massive user base. Postgres was chosen over Cassandra since it was easier for querying, debugging, and managing data relationships. To scale, Reddit used table partitioning and JSONB denormalization, achieving low-latency reads without needing a read-through cache.