There have been two approaches: Riak and Cassandra stress availability, while HBase has stressed consistency.
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BigCouch is an interesting effort to integrate clustering into CouchDB, making it more like Riak.
Riak can also be viewed as a document database, though with more flexibility about document types.
Then Mr Garang's second-in-command, Riak Machar, tried to overthrow him, and the movement split.
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With Cassandra and Riak, the tradeoff between consistency and availability is tunable.
Riak also offers a more traditional protocol buffer interface, which is a better fit if you expect a high volume of small requests.
RESTful interfaces: CouchDB and Riak are unique in offering RESTful interfaces.
Like CouchDB, Riak incorporates MapReduce to perform complex queries efficiently.
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