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In a multi-master cluster, all DB instances can perform write operations. The notions of a single read/write primary instance and multiple read-only Aurora Replicas don't apply.
The multi-master does not have read replicas and two nodes R/W.
Because binlog replication is not available, EC2 can also be used for replication Not possible. As a result, it is currently difficult to scale out read workloads on multi-master.
Yes, active-passive workloads minimize any downtime for write operations. However, if one of the nodes dies, the mechanism for accessing the other node is the application's It is a responsibility. Cluster endpoints are not used for DML in Multi-master.
Check out those other limitatons.
What seconds of downtime is acceptable? You may want to review DB connection management first. There are best practices for DNS caching, Smart drivers, etc.
https://d1.awsstatic.com/whitepapers/RDS/amazon-aurora-connection-management-handbook.pdf
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