14.1 Requirements & Capacity Estimation

• DAU: 10 million active users
• New URLs / Month: 100 million
• Read/Write Ratio: 100:1 (Read heavy)
• Write QPS: ~40 URLs/sec
• Read QPS: ~4,000 redirects/sec (Peak ~12,000 QPS)
• Storage: ~500 bytes per URL record * 100M = 50GB / month, ~3TB over 5 years.