Queries Via MapReduce

Queries Via MapReduce

Map-reduce is one of the most powerful tools for searching data in a distributed Key-Value database. It is the primary mechanism for making selections among data in the database based on the values themselves.
You can read Basho’s manual on MapReduce for a thorough explanation.
http://wiki.basho.com/MapReduce.html
Also, check out the MapReduce() function in the Bucket class in the API reference.