f01a04ea2d
Summary: Update HISTORY.md to make existing items to 2.8 release and add something I think is missing. Test Plan: N/A Reviewers: haobo, igor, ljin, dhruba, yhchiang, xjin Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D17517
73 lines
4.9 KiB
Markdown
73 lines
4.9 KiB
Markdown
# Rocksdb Change Log
|
|
|
|
## Unreleased
|
|
|
|
### Public API changes
|
|
|
|
## 2.8.0 (04/04/2014)
|
|
|
|
* Removed arena.h from public header files.
|
|
* By default, checksums are verified on every read from database
|
|
* 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
|
|
* Added is_manual_compaction to CompactionFilter::Context
|
|
* Added "virtual void WaitForJoin()" in class Env. Default operation is no-op.
|
|
* Removed BackupEngine::DeleteBackupsNewerThan() function
|
|
* Added new option -- verify_checksums_in_compaction
|
|
* Changed Options.prefix_extractor from raw pointer to shared_ptr (take ownership)
|
|
Changed HashSkipListRepFactory and HashLinkListRepFactory constructor to not take SliceTransform object (use Options.prefix_extractor implicitly)
|
|
* Added Env::GetThreadPoolQueueLen(), which returns the waiting queue length of thread pools
|
|
* Added a command "checkconsistency" in ldb tool, which checks
|
|
if file system state matches DB state (file existence and file sizes)
|
|
* Separate options related to block based table to a new struct BlockBasedTableOptions
|
|
* WriteBatch has a new function Count() to return total size in the batch, and Data() now returns a reference instead of a copy
|
|
* Add more counters to perf context.
|
|
* Supports several more DB properties: compaction-pending, background-errors and cur-size-active-mem-table.
|
|
|
|
### New Features
|
|
* If we find one truncated record at the end of the MANIFEST or WAL files,
|
|
we will ignore it. We assume that writers of these records were interrupted
|
|
and that we can safely ignore it.
|
|
* A new SST format "PlainTable" is added, which is optimized for memory-only workloads. It can be created through NewPlainTableFactory() or NewTotalOrderPlainTableFactory().
|
|
* 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().
|
|
* Merge operator supports a new function PartialMergeMulti() to allow users to do partial merges against multiple operands.
|
|
* 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.
|
|
* Geo-spatial support for locations and radial-search.
|
|
|
|
## 2.7.0 (01/28/2014)
|
|
|
|
### Public API changes
|
|
|
|
* Renamed `StackableDB::GetRawDB()` to `StackableDB::GetBaseDB()`.
|
|
* Renamed `WriteBatch::Data()` `const std::string& Data() const`.
|
|
* Renamed class `TableStats` to `TableProperties`.
|
|
* Deleted class `PrefixHashRepFactory`. Please use `NewHashSkipListRepFactory()` instead.
|
|
* Supported multi-threaded `EnableFileDeletions()` and `DisableFileDeletions()`.
|
|
* Added `DB::GetOptions()`.
|
|
* Added `DB::GetDbIdentity()`.
|
|
|
|
### New Features
|
|
|
|
* Added [BackupableDB](https://github.com/facebook/rocksdb/wiki/How-to-backup-RocksDB%3F)
|
|
* Implemented [TailingIterator](https://github.com/facebook/rocksdb/wiki/Tailing-Iterator), a special type of iterator that
|
|
doesn't create a snapshot (can be used to read newly inserted data)
|
|
and is optimized for doing sequential reads.
|
|
* Added property block for table, which allows (1) a table to store
|
|
its metadata and (2) end user to collect and store properties they
|
|
are interested in.
|
|
* Enabled caching index and filter block in block cache (turned off by default).
|
|
* Supported error report when doing manual compaction.
|
|
* Supported additional Linux platform flavors and Mac OS.
|
|
* Put with `SliceParts` - Variant of `Put()` that gathers output like `writev(2)`
|
|
* Bug fixes and code refactor for compatibility with upcoming Column
|
|
Family feature.
|
|
|
|
### Performance Improvements
|
|
|
|
* 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]
|
|
* Speeding up a way RocksDB deleted obsolete files - no longer listing the whole directory under a lock -- decrease in p99
|
|
* 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
|
|
* Optimized locking for `Get()` -- [1fdb3f](https://github.com/facebook/rocksdb/commit/1fdb3f7dc60e96394e3e5b69a46ede5d67fb976c) -- 1.5x QPS increase for some workloads
|
|
* Cache speedup - [e8d40c3](https://github.com/facebook/rocksdb/commit/e8d40c31b3cca0c3e1ae9abe9b9003b1288026a9)
|
|
* 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)
|
|
* Lots of efforts to move malloc, memcpy and IO outside of locks
|