[wp-hackers] Alternative DB lib for load balancing

[Mark E]

Looking for some specific code:

There is, or was, a drop-in database lib tool for WordPress that can 
allow a site to have multiple read/write database servers.
If I recall correctly this was developed years ago in the earlier days 
of WP.org and I believe this was built and made available as open source 
to by Automattic.

Basically what it does is the you configure the site so the any number 
of database servers can be used for ultra high traffic scenarios, and 
each DB server in the config can be set for reads or writes. Then when 
WP needs to do a query it determines which server to send the request 
to. Something like that.

Anyone know where that code is located?

Mark