ARC-209 Architecture Patterns for Multi-Region Active-Active Applications – Key Takeaways

The Key

• Multi-region ≠ Multi-region Active-Active
  • Scheduled replication
  • Near real-time replication
  • Master-replica
  • Master-master
• Patterns
  • Read local, write global
  • Read local, write partitioned
    • Write distributed and synchronize
  • Read local, write local
    • Synchronize afterward, race conditions may happen

The Takeaways

• You may not need multi-region active-active as it is complex and cost more
  • backup & restore, pilot light, warm standby are simpler models
• Services have their built-in multi-region support
  • S3 cross-region replication
  • EBS snapshot cross-region copy
  • DynamoDB global tables (multi-master)
  • RDS cross-region replica
  • VPC cross-region peering
  • CloudFormation StackSets deploys to multiple accounts & regions
  • Config rules aggregates configuration change from multiple accounts & regions
  • Systems Manager
    • automation takes actions in multiple accounts & regions
    • inventory
  • CloudWatch logs
• Route 53
  • Latency based routing
  • Geolocation based routing
  • DNS failover