Code Library

Like Voldemort, Riak was inspired by Amazon’s Dynamo database, and it offers a key/ value interface and is designed to run on large distributed clusters. It also uses consistent hashing and a gossip protocol to avoid the need for the kind of centralized index server that BigTable requires, along with versioning to handle update conflicts. Querying is handled using MapReduce functions written in either Erlang or JavaScript. It’s open source under an Apache license, but there’s also a closed source commercial version with some special features designed for enterprise customers.

Source of Information : Big data Glossary