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rocksdb/HISTORY.md

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Add history log and revise script Summary: * Add a change log for rocksdb releases. * Remove the hacky parts of make_new_version.sh, which are either no longer useful or will be done in our dedicated 3rd-party release tool. Test Plan: N/A Reviewers: igor, haobo, sdong, dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D15543
2014-01-28 22:06:09 +01:00
# Rocksdb Change Log
Fix corruption_test failure caused by auto-enablement of checksum verification. Summary: Patch https://reviews.facebook.net/D15591 enabled checksum verification by default. This caused the unit test to fail. Test Plan: ./corruption_test Reviewers: igor, kailiu Reviewed By: igor CC: leveldb Differential Revision: https://reviews.facebook.net/D15795
2014-02-01 02:16:30 +01:00
## Unreleased
Clean up arena API Summary: Easy thing goes first. This patch moves arena to internal dir; based on which, the coming patch will deal with memtable_rep. Test Plan: make check Reviewers: haobo, sdong, dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D15615
2014-01-31 02:18:17 +01:00
### Public API changes
* Removed arena.h from public header files.
Fix corruption_test failure caused by auto-enablement of checksum verification. Summary: Patch https://reviews.facebook.net/D15591 enabled checksum verification by default. This caused the unit test to fail. Test Plan: ./corruption_test Reviewers: igor, kailiu Reviewed By: igor CC: leveldb Differential Revision: https://reviews.facebook.net/D15795
2014-02-01 02:16:30 +01:00
* By default, checksums are verified on every read from database
CompactionContext to include is_manual_compaction Summary: Added a bit more information to compaction context, requested by internal team at FB. Test Plan: Modified CompactionFilter test to make sure is_manual_compaction is properly set. Reviewers: haobo Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D16095
2014-02-12 21:24:18 +01:00
* Added is_manual_compaction to CompactionFilter::Context
thread local pointer storage Summary: This is not a generic thread local implementation in the sense that it only takes pointer. But it does support multiple instances per thread and lets user plugin function to perform cleanup when thread exits or an instance gets destroyed. Test Plan: unit test for now Reviewers: haobo, igor, sdong, dhruba Reviewed By: igor CC: leveldb, kailiu Differential Revision: https://reviews.facebook.net/D16131
2014-02-26 02:47:37 +01:00
* Added "virtual void WaitForJoin() = 0" in class Env
Fix corruption_test failure caused by auto-enablement of checksum verification. Summary: Patch https://reviews.facebook.net/D15591 enabled checksum verification by default. This caused the unit test to fail. Test Plan: ./corruption_test Reviewers: igor, kailiu Reviewed By: igor CC: leveldb Differential Revision: https://reviews.facebook.net/D15795
2014-02-01 02:16:30 +01:00
Add history log and revise script Summary: * Add a change log for rocksdb releases. * Remove the hacky parts of make_new_version.sh, which are either no longer useful or will be done in our dedicated 3rd-party release tool. Test Plan: N/A Reviewers: igor, haobo, sdong, dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D15543
2014-01-28 22:06:09 +01:00
## 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
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