LevelDB – Fast and Lightweight Key/Value Database From the Authors of MapReduce and BigTable
From the post:
LevelDB is an exciting new entrant into the pantheon of embedded databases, notable both for its pedigree, being authored by the makers of the now mythical Google MapReduce and BigTable products, and for its emphasis on efficient disk based random access using log-structured-merge (LSM) trees.
The plan is to keep LevelDB fairly low-level. The intention is that it will be a useful building block for higher-level storage systems. Basho is already investigating using LevelDB as one if its storage engines.
Includes a great summary of information from the LevelDB mailing list.
A must read if you are interested in LevelDB.