Java: large persistent hash structure?

Question

I\'m looking for a persistent hash structure in java, a simple key-value store, where key is a unique string and value is an int. The value of a key is to be incremented eac

Answer 1

I thing Megamap is what you are looking for: http://megamap.sourceforge.net/. Here is a short description of Megamap from its homepage:

MegaMap is a Java implementation of a map (or hashtable) that can store an unbounded amount of data, limited only by the amount of disk space available. Objects stored in the map are persisted to disk. Good performance is achieved by an in-memory cache. The MegaMap can, for all practical reasons, be thought of as a map implementation with unlimited storage space.