This page will describe how to install ApacheSolr and connect it to SearchAPI, using Views to deliver Solr content.
Installing ApacheSolr (OSX/Linux)
Installing & Configuring SearchAPI
Randomly Sorting Listings with Solr and Views
Some views may need to be randomly sorted, like when you're showing off a random listing in a sidebar of a theme. To do that, you will need the patches found here: