I don’t see a lot of links on autoscaling AWS RDS read slaves.
Is the reason:
- AWS RDS users are simply content with relying on features as they arrive?
- users could just be upsizing RDS masters or moving to Aurora, etc. as load increases?
- only a small percentage of businesses have big data issues?
- software developers at other companies religiously run EXPLAIN?
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Below are some insightful comments and some projects that have implemented this.
“It should be fairly easy to create a data-driven auto scaling database cluster using Read Replicas and CloudWatch metrics.
At the low end, this cluster would consist of a Small DB Instance running in one Availability Zone with 5 GB of storage.At the high end it would consist of a High Memory Quadruple Extra Large Multi-AZ deployment (primary/secondary pair) DB Instance with 1 TB of storage and 5 associated Read Replicas. That’s quite a range!”
harish11g.com: Load Balancing Amazon RDS Read Replica’s using HAProxy
github.com: ReDS – ReActive Database System – Terraform – Auto-Scale for RDS Instances
Other Resources
docs.aws.amazon.com: Replication with a MySQL or MariaDB Instance Running External to Amazon RDS