Amazon RDS Multi-AZ with two readable standbys: Under the hood
Database Blog
This article explains the design and inner workings of Amazon RDS Multi-AZ DB clusters with two readable standbys. It provides an overview of how this configuration ensures high availability, read scalability, and data durability for MySQL and PostgreSQL databases.
Specifically, the article covers:
- Basic architecture of a Multi-AZ DB cluster with one primary and two standby instances across different Availability Zones
- How writes are propagated from the primary to the standby instances using semi-synchronous replication
- The failover process when the primary instance becomes unavailable
- Handling various failure scenarios like connectivity issues, instance failures, and region/AZ outages
- Monitoring systems and automated recovery procedures to ensure data availability and durability
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