Simon Willison’s Weblog

2 items tagged “migration”

Migrating Messenger storage to optimize performance (via) Fascinating case-study of a truly gargantuan migration. Messenger has over a billion users, and Facebook successfully migrated its backend storage from HBase to their MyRocks database (a fork of MySQL with a storage engine built on their SSD-optimized RocksDB key/value library) without any user-visible downtime. They ended up using two migration paths: one for the 99.9% of regular accounts, and a separate path for extremely high volume accounts (businesses with very active chat bots or support systems). # 27th June 2018, 3:05 pm

Django Evolution. Really smart take on the problem of updating database tables to reflect changes to Django models. Code that automatically modifies your database tables can be pretty scary, but Evolution seems to hit the right balance. # 23rd November 2007, 11:49 pm