1.6 KiB
Further Features
The store supports all the required Riak backend capabilities. A number of further features are either partially included, in progress or under consideration:
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Support for HEAD operations, and changes to GET/PUT Riak paths to use HEAD requests where GET requests would be unnecessary.
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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).
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A fast "list bucket" capability, borrowing from the HanoiDB implementation, to allow for safe bucket listing in production.
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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.
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Support for a specific Riak tombstone tag where reaping of tombstones can be deferred (by many days) i.e. so that a 'sort-of-keep' deletion strategy can be followed that will eventually garbage collect without the need to hold pending full deletion state in memory.
Outstanding work
There is some work required before LevelEd could be considered production ready:
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A strategy for the supervision and restart of processes, in particular for clerks.
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Further functional testing within the context of Riak.
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Introduction of property-based testing.
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Riak modifications to support the optimised Key/Clock scanning for hashtree rebuilds.
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Amend compaction scheduling to ensure that all vnodes do not try to concurrently compact during a single window.
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Improved handling of corrupted files.
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A way of identifying the partition in each log to ease the difficulty of tracing activity when multiple stores are run in parallel.