Aurora mysql: Started cross AZ failover to DB instance event

Hi, Good Question.

If the only thing that has changed is the version (2.10.1/MySQL 5.7 from 1.23/MySQL 5.6), check out: https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Updates.2101.html.

Upgrading to 2.10.1 from 1.23 is considered a major version upgrade for Aurora and has some changes that could cause different behavior: *https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Updates.MajorVersionUpgrade.html#AuroraMySQL.Updates.MajorVersionUpgrade.1to2

See the following for information about 2.10.1:

• https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Updates.2101.html

From a 5.6 -> 5.7 MySQL perspective, there also are some changes:

• https://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html