Migration Planning

https://newsletter.pragmaticengineer.com/p/real-world-engineering-challenges

tl;dr Migration plan What do we need to consider?

• Downtime
• Data consistency
• Rollback plan
• Observable and measurable
• Team awareness

Common steps

• Dual reads / writes -> old database is primary
• Backfilling
• Compare and validate new database
• Dual reads / writes -> new database is primary
• Remove old database