ForestDB 1.0 Beta

We are pleased to announce the ForestDB 1.0 Beta availability. The ForestDB project was launched a year ago as part of developing the new storage engine for Couchbase NoSQL database system.

The ForestDB's main features are summarized as follows:

• Main index structure is built using the Hierarchical B+-Tree based Trie, called HB+-Trie, to address the main drawbacks of general-purpose B+-Tree index structure.
• Keys and values are treated as an arbitrary binary.
• Applications can supply a custom compare function to support a customized key order.
• A value can be retrieved by its sequence number or disk offset in addition to a key.
• Write-Ahead Logging (WAL) and its in-memory index are used to reduce the main index lookup / update overhead.
• Multi-Version Concurrency Control (MVCC) support and append-only storage layer.
• Multiple snapshot instances can be created from a given ForestDB instance to provide different views of database.
• Rollback is supported to revert the database to a specific point.
• Ranged iteration by keys or sequence numbers is supported for a partial or full range lookup operation.
• Manual or auto compaction can be configured per ForestDB database file.
• Transactional support with read_committed or read_uncommitted isolation level.

For more details, please visit the ForestDB wiki page. The Beta code branch can be checked out in https://github.com/couchbaselabs/forestdb/tree/1.0b

ForestDB is the open source project under Apache 2.0 license. We always welcome any feedback and contributions from the community.