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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
11 years ago
# Rocksdb Change Log
Flushes should always go to HIGH priority thread pool Summary: This is not column-family related diff. It is in columnfamily branch because the change is significant and we want to push it with next major release (3.0). It removes the leveldb notion of one thread pool and expands it to two thread pools by default (HIGH and LOW). Flush process is removed from compaction process and all flush threads are executed on HIGH thread pool, since we don't want long-running compactions to influence flush latency. Test Plan: make check Reviewers: dhruba, haobo, kailiu, sdong CC: leveldb Differential Revision: https://reviews.facebook.net/D15987
11 years ago
## Unreleased (will be released in 3.0)
* By default, max_background_flushes is 1 and flush process is
removed from background compaction process. Flush process is now always
executed in high priority thread pool.
[CF] Code cleanup part 1 Summary: I'm cleaning up some code preparing for the big diff review tomorrow. This is the first part of the cleanup. Changes are mostly cosmetic. The goal is to decrease amount of code difference between columnfamilies and master branch. This diff also fixes race condition when dropping column family. Test Plan: Ran db_stress with variety of parameters Reviewers: dhruba, haobo Differential Revision: https://reviews.facebook.net/D16833
11 years ago
* Column family support
* If you write something to the non-default column family with disableWAL = true,
you need to Flush the column family before exiting if you want your data to be persistent
Flushes should always go to HIGH priority thread pool Summary: This is not column-family related diff. It is in columnfamily branch because the change is significant and we want to push it with next major release (3.0). It removes the leveldb notion of one thread pool and expands it to two thread pools by default (HIGH and LOW). Flush process is removed from compaction process and all flush threads are executed on HIGH thread pool, since we don't want long-running compactions to influence flush latency. Test Plan: make check Reviewers: dhruba, haobo, kailiu, sdong CC: leveldb Differential Revision: https://reviews.facebook.net/D15987
11 years ago
## Unreleased (will be relased in 2.8)
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
11 years ago
### Public API changes
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
11 years ago
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
11 years ago
* 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
11 years ago
* 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
11 years ago
* 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
11 years ago
* Added "virtual void WaitForJoin() = 0" in class Env
Some fixes to BackupableDB Summary: (1) Report corruption if backup meta file has tailing data that was not read. This should fix: https://github.com/facebook/rocksdb/issues/81 (also, @sdong reported similar issue) (2) Don't use OS buffer when copying file to backup directory. We don't need the file in cache since we won't be reading it twice (3) Don't delete newer backups when somebody tries to backup the diverged DB (restore from older backup, add new data, try to backup). Rather, just fail the new backup. Test Plan: backupable_db_test Reviewers: ljin, dhruba, sdong Reviewed By: ljin CC: leveldb, sdong Differential Revision: https://reviews.facebook.net/D16287
11 years ago
* Removed BackupEngine::DeleteBackupsNewerThan() function
Add option verify_checksums_in_compaction Summary: If verify_checksums_in_compaction is true, compaction will verify checksums. This is default. If it's false, compaction doesn't verify checksums. This is useful for in-memory workloads. Test Plan: corruption_test Reviewers: dhruba Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D16695
11 years ago
* Added new option -- verify_checksums_in_compaction
Consolidate SliceTransform object ownership Summary: (1) Fix SanitizeOptions() to also check HashLinkList. The current dynamic case just happens to work because the 2 classes have the same layout. (2) Do not delete SliceTransform object in HashSkipListFactory and HashLinkListFactory destructor. Reason: SanitizeOptions() enforces prefix_extractor and SliceTransform to be the same object when Hash**Factory is used. This makes the behavior strange: when Hash**Factory is used, prefix_extractor will be released by RocksDB. If other memtable factory is used, prefix_extractor should be released by user. Test Plan: db_bench && make asan_check Reviewers: haobo, igor, sdong Reviewed By: igor CC: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D16587
11 years ago
* Chagned 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)
Env to add a function to allow users to query waiting queue length Summary: Add a function to Env so that users can query the waiting queue length of each thread pool Test Plan: add a test in env_test Reviewers: haobo Reviewed By: haobo CC: dhruba, igor, yhchiang, ljin, nkg-, leveldb Differential Revision: https://reviews.facebook.net/D16755
11 years ago
* Added Env::GetThreadPoolQueueLen(), which returns the waiting queue length of thread pools
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
11 years ago
Make Log::Reader more robust Summary: This diff does two things: (1) Log::Reader does not report a corruption when the last record in a log or manifest file is truncated (meaning that log writer died in the middle of the write). Inherited the code from LevelDB: https://code.google.com/p/leveldb/source/detail?r=269fc6ca9416129248db5ca57050cd5d39d177c8# (2) Turn off mmap writes for all writes to log and manifest files (2) is necessary because if we use mmap writes, the last record is not truncated, but is actually filled with zeros, making checksum fail. It is hard to recover from checksum failing. Test Plan: Added unit tests from LevelDB Actually recovered a "corrupted" MANIFEST file. Reviewers: dhruba, haobo Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D16119
11 years ago
### 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.
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
11 years ago
## 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