Fallback/multiple database support

[jcpunk]

I've got a master/master MariaDB setup and I'd love to be able to set multiple hostnames in wordpress to utilize this high availability cluster.

They share user/pass/dbname it is just that I've got multiple dbhosts.

I've little interest in sharding or load balancing between the systems. I just desire: if wordpress can't connect to one host that it tries another.

[wonderboymusic]

Yep:
​http://wordpress.org/plugins/hyperdb/

This won't be added to core - but is the standard for setting up your DB cluster.

[jcpunk]

The listed compatibility of that plugin is way back at 3.5.2

[wonderboymusic]

It is used on every major WordPress website. WordPress.com, The New York Times, etc

[nacin]

I'll harass someone to get it updated, but note it works fine with the latest version of WordPress and we use it on WordPress.org (it also powers WordPress.com).