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Correct order to Upgrade/Update Aurora MySQL Cluster with Cross-region Replica
Hello, We have an RDS Aurora MySQL Cluster with cross-region Replica, and I would like to know the correct order to upgrade them. I have search the documentation but I could not find an statement where it specifies which should be upgraded first, the Replica or the Master. For a minor version upgrade which one should be first ? For a major version upgrade which one should be first ?
Thanks in advance.
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The correct order is to upgrade the replica first for both minor/major version upgrades when using Aurora MySQL cross-region replicas. This is due to the usage of binary log replication which only supports a older source to a newer replica. More information can be found in the MySQL documentation here
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