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74 lines
4.9 KiB
Markdown
74 lines
4.9 KiB
Markdown
# Rocksdb Change Log
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## Unreleased (will be released in 3.0)
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* Column family support
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### Public API changes
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## 2.8.0 (04/04/2014)
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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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* Change default value of several options, including: paranoid_checks=true, max_open_files=5000, level0_slowdown_writes_trigger=20, level0_stop_writes_trigger=24, disable_seek_compaction=true, max_background_flushes=1 and allow_mmap_writes=false
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* Added is_manual_compaction to CompactionFilter::Context
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* Added "virtual void WaitForJoin()" in class Env. Default operation is no-op.
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* Removed BackupEngine::DeleteBackupsNewerThan() function
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* Added new option -- verify_checksums_in_compaction
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* Changed Options.prefix_extractor from raw pointer to shared_ptr (take ownership)
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Changed HashSkipListRepFactory and HashLinkListRepFactory constructor to not take SliceTransform object (use Options.prefix_extractor implicitly)
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* Added Env::GetThreadPoolQueueLen(), which returns the waiting queue length of thread pools
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* Added a command "checkconsistency" in ldb tool, which checks
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if file system state matches DB state (file existence and file sizes)
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* Separate options related to block based table to a new struct BlockBasedTableOptions
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* WriteBatch has a new function Count() to return total size in the batch, and Data() now returns a reference instead of a copy
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* Add more counters to perf context.
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* Supports several more DB properties: compaction-pending, background-errors and cur-size-active-mem-table.
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### New Features
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* If we find one truncated record at the end of the MANIFEST or WAL files,
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we will ignore it. We assume that writers of these records were interrupted
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and that we can safely ignore it.
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* A new SST format "PlainTable" is added, which is optimized for memory-only workloads. It can be created through NewPlainTableFactory() or NewTotalOrderPlainTableFactory().
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* A new mem table implementation hash linked list optimizing for the case that there are only few keys for each prefix, which can be created through NewHashLinkListRepFactory().
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* Merge operator supports a new function PartialMergeMulti() to allow users to do partial merges against multiple operands.
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* Now compaction filter has a V2 interface. It buffers the kv-pairs sharing the same key prefix, process them in batches, and return the batched results back to DB. The new interface uses a new structure CompactionFilterContext for the same purpose as CompactionFilter::Context in V1.
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* Geo-spatial support for locations and radial-search.
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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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