The store supports all the required Riak backend capabilities. A number of further features are either partially included, in progress or under consideration:
- Support for HEAD operations, and changes to GET/PUT Riak paths to use HEAD requests where GET requests would be unnecessary.
- Support for "Tags" in keys to allow for different treatment of different key types (i.e. changes in merge actions, metadata retention, caching for lookups).
- A fast "list bucket" capability, borrowing from the HanoiDB implementation, to allow for safe bucket listing in production.
- A bucket size query, which requires traversal only of the Ledger and counts the keys and sums he total on-disk size of the objects within the bucket.
- Support for a specific Riak tombstone tag where reaping of tombstones can be deferred (by many days) i.e. so that a 'keep' deletion strategy can be followed that will eventually garbage collect.
## Outstanding work
There is some work required before LevelEd could be considered production ready:
- A strategy for supervision an restart of processes, in particular for clerks.
- Further functional testing within the context of Riak.
- Introduction of property-based testing.
- Riak modifications to support the optimised Key/Clock scanning for hashtree rebuilds.
