Hadoop
Update: Building Voldemort read-only stores with Hadoop. A write up on what LinkedIn is doing to integrate large offline Hadoop data processing jobs with a fast, distributed online key-value storage system, Project Voldemort.
Java
IBM WebSphere eXtreme Scale is IBMs in memory data grid product (IMDG). It can be used as a key-value store which partitions the keys (using a form of consistent hashing) over a set of servers such that each server is responsible for a subset of the keys. It automatically handles
Paper
Consistent hashing is one of those ideas that really puts the science in computer science and reminds us why all those really smart people spend years slaving over algorithms. Consistent hashing is "a scheme that provides hash table functionality in a way that the addition or removal of one