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Re:Wordpress.com serves 70k requests/second using Nginx by ck2 on Wednesday September 26, 2012 @06:26PM (#4578349)
I know they replace the database class on wp.com to support replication (I think they even released the code once) but I don't think they do extensive changes otherwise unless you've actually read otherwise.
Re:Wordpress.com serves 70k requests/second using Nginx by robmil on Wednesday September 26, 2012 @07:21PM (#4578533)
It's called HyperDB, and they did indeed release it: http://codex.wordpress.org/HyperDB