So in other words, they had to hack together some tools to get clustering features on a crucial piece of company infrastructure. I understand that relational databases have been around for 40 years but very few of them come close to offering the multi-master replication or master-election protocols implemented in modern NOSQL.
Actually MySQL has a well working multi-master replication with great automatic master election protocol and automatic client routing towards the current master. It's called InnoDB cluster, and my other comment, where I was trying to start a discussion around it, was downvoted.
