47 lines
2.6 KiB
Markdown
47 lines
2.6 KiB
Markdown
# Rocksdb Change Log
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## Unreleased
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### Public API changes
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* Removed arena.h from public header files.
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* By default, checksums are verified on every read from database
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## 2.7.0 (01/28/2014)
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### Public API changes
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* Renamed `StackableDB::GetRawDB()` to `StackableDB::GetBaseDB()`.
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* Renamed `WriteBatch::Data()` `const std::string& Data() const`.
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* Renamed class `TableStats` to `TableProperties`.
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* Deleted class `PrefixHashRepFactory`. Please use `NewHashSkipListRepFactory()` instead.
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* Supported multi-threaded `EnableFileDeletions()` and `DisableFileDeletions()`.
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* Added `DB::GetOptions()`.
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* Added `DB::GetDbIdentity()`.
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### New Features
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* Added [BackupableDB](https://github.com/facebook/rocksdb/wiki/How-to-backup-RocksDB%3F)
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* Implemented [TailingIterator](https://github.com/facebook/rocksdb/wiki/Tailing-Iterator), a special type of iterator that
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doesn't create a snapshot (can be used to read newly inserted data)
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and is optimized for doing sequential reads.
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* Added property block for table, which allows (1) a table to store
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its metadata and (2) end user to collect and store properties they
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are interested in.
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* Enabled caching index and filter block in block cache (turned off by default).
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* Supported error report when doing manual compaction.
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* Supported additional Linux platform flavors and Mac OS.
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* Put with `SliceParts` - Variant of `Put()` that gathers output like `writev(2)`
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* Bug fixes and code refactor for compatibility with upcoming Column
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Family feature.
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### Performance Improvements
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* Huge benchmark performance improvements by multiple efforts. For example, increase in readonly QPS from about 530k in 2.6 release to 1.1 million in 2.7 [1]
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* Speeding up a way RocksDB deleted obsolete files - no longer listing the whole directory under a lock -- decrease in p99
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* Use raw pointer instead of shared pointer for statistics: [5b825d](https://github.com/facebook/rocksdb/commit/5b825d6964e26ec3b4bb6faa708ebb1787f1d7bd) -- huge increase in performance -- shared pointers are slow
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* Optimized locking for `Get()` -- [1fdb3f](https://github.com/facebook/rocksdb/commit/1fdb3f7dc60e96394e3e5b69a46ede5d67fb976c) -- 1.5x QPS increase for some workloads
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* Cache speedup - [e8d40c3](https://github.com/facebook/rocksdb/commit/e8d40c31b3cca0c3e1ae9abe9b9003b1288026a9)
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* Implemented autovector, which allocates first N elements on stack. Most of vectors in RocksDB are small. Also, we never want to allocate heap objects while holding a mutex. -- [c01676e4](https://github.com/facebook/rocksdb/commit/c01676e46d3be08c3c140361ef1f5884f47d3b3c)
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* Lots of efforts to move malloc, memcpy and IO outside of locks
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