couchproxy

https://github.com/dgraham/couchproxy

CouchProxy is a simple proxy server that distributes reads and writes to a cluster of Apache CouchDB servers so they appear to be a single huge database. Documents are stored and retrieved from a particular CouchDB instance, using consistent hashing of the document id. Map/reduce views are processed concurrently on each CouchDB instance and merged together by the proxy before returning the results to the client.