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CHANGELOG.md

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3.1.0

  • [feat] Implemented support for compaction filters (custom logic during compactions)
  • [msrv] Reduced MSRV to 1.90

3.0.0

  • [feat] Implemented new block format in lsm-tree
  • [feat] Bookkeep LSM-tree changes (flushes, compactions) in Version history
  • [feat] Prefix truncation inside data & index blocks
  • [feat] Allow unpinning filter blocks
  • [feat] Implemented partitioned filters
  • [feat] Allow calling bulk ingestion on non-empty keyspaces
  • [feat] Introduced level-based configuration policies for most configuration parameters
  • [feat] Journal compression for large values
  • [feat] Database locking using the new Rust file locking API
  • [feat] Rewritten key-value separation to run during compactions, instead of dedicated GC runs
  • [feat] Full file checksums to allow fast database corruption checks (in the future)
  • [feat] Checksum check on block & blob reads
  • [api] Make Ingestion API more flexible
  • [feat] Shortening eligible sequence numbers when compacting into the last level to save disk space
  • [api] Change constructor to Database::builder instead of Config::new
  • [api] Changed naming of keyspace->database, and partition->keyspace
  • [api] Change transaction feature flags to be separate structs, OptimisticTxDatabase and SingleWriterTxDatabase
  • [api] Changed snapshot error type, fixes #156
  • [api] Unified transactions read operations and snapshots with Readable trait
  • [api] Guard API for iterator values
  • [api] Removed old garbage collection APIs
  • [api] metrics feature flag for cache hit rates etc. (will be exposed in the future)
  • [api] Change bytes feature flag to bytes_1 to pin its version
  • [api] Make read operations in optimistic write transactions non-mut
  • [fix] Consider blob files in FIFO compaction size limit, fixes #133
  • [perf] Use a single hash per key for filters, instead of two
  • [perf] Improve leveled compaction scoring
  • [perf] Improve leveled compaction picking to use less hashing and heap allocations
  • [perf] Use quick-cache for file descriptor caching
  • [perf] Promote levels immediately to L6 to get rid of tombstones easily
  • [perf] Rewritten maintenance task bookkeeping, and write stalling mechanisms to be less aggressive
  • [perf] Allow lsm-tree flushes to merge multiple sealed memtables into L0, if necessary
  • [perf] Skip heap allocation in blob memtable inserts
  • [perf] Skip compression when rewriting compressed blob files
  • [msrv] Increased MSRV to 1.91
  • [misc] Blob file descriptor caching
  • [misc] Use Rust native path::absolute, removing path-absolutize dependency
  • [misc] Remove std-semaphore dependency
  • [misc] Remove miniz (will be replaced in the future)
  • [misc] Use byteorder-lite as drop-in replacement for byteorder
  • [refactor] Changed background workers to be a single thread pool
  • [internal] Store keyspace configurations in a meta keyspace, instead of individual binary config files
  • [internal] Use sfa for most file scaffolding in lsm-tree
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