Voldemort
A distributed key-value storage system
Voldemort is a distributed database that’s an open source clone of Amazon’s Dynamo. It automatically replicates data over multiple servers, and automatically partitions them as well so each server only contains a subset of the total data. It offers many other features such as pluggable serialization support, data item versioning and an SSD Optimized Read Write storage engine.
Voldemort is not a relational database or an object database. It is essentially a big, distributed, persistent, fault-tolerant hash table. ...