On our August meeting Richard Shaw from Basho talked about Yokozuna, combining Solr with Riak.
Abstract:
Solr is a well-established search technology in the JVM software space, providing scalable and highly-reliable search indexing for many of the world’s largest internet sites. With Riak, our open-source, distributed, fault-tolerant database we’re building direct support into Riak to allow you to perform document-based searching at scale.
More Information:
Yokozuna Github Project
https://github.com/basho/yokozuna
Basho’s awesome docs
http://docs.basho.com