Riak Full text search is fun to work with and as simple to set up as the rest of Riak. They offer a Solr interface, but don't support all of the operations yet

Riak Full text search is fun to work with and as simple to set up as the rest of Riak. They offer a Solr interface, but don't support all of the operations yet (e.g. http://wiki.basho.com/Riak-Search---Querying.html#Faceted-Queries-via-the-Solr-Interfae http://wiki.basho.com/Riak-Search---Querying.html#Faceted-Qu... --> Facet querying through the Solr interface is not yet supported. ). Riak isn't the fastest single node system, but if you're going big and need several servers anyway it will save you some time. CouchDB could use elasticsearch and its streaming indexation ("river" -> http://www.elasticsearch.org/docs/elasticsearch/river/couchdb/ http://www.elasticsearch.org/docs/elasticsearch/river/couchd... ) to get scalable fulltext search. An interesting project for fulltext search when it comes to mongodb and SOLR is photovoltaic ( https://github.com/mikejs/photovoltaic https://github.com/mikejs/photovoltaic ), it pipes the mongoDB changes to the Solr XML interface. Sadly, I haven't had time to use it yet, but it looks interesting.