LevelDB: Google’s Fast Persistent Key-Value Store Library
Google open sourced a while ago LevelDB , a C++ library that provides an ordered mapping key-value storage. LevelDB performance convinced Basho guys to experiment with adding LevelDB as a storage engine for Riak. And there’s also a benchmark comparing LevelDB with SQLite and Kyoto Cabinet.
The LevelDB project lists the following key features:
- Keys and values are arbitrary byte arrays.
- Data is stored sorted by key.
- Callers can provide a custom comparison function to override the sort order.
- The basic operations are
Put(key,value),Get(key),Delete(key). - Multiple changes can be made in one atomic batch.
- Users can create a transient snapshot to get a consistent view of data.
- Forward and backward iteration is supported over the data.
- Data is automatically compressed using the Snappy compression library.
- External activity (file system operations etc.) is relayed through a virtual interface so users can customize the operating system interactions.
- Detailed documentation about how to use the library is included with the source code.
You can check out also the old thread on Hacker News about LevelDB..
Original title and link: LevelDB: Google’s Fast Persistent Key-Value Store Library (©myNoSQL)
