0.4.2

What's Changed

Behavior Changes

• When log rewrite encounters IO failures, Raft Engine will return an error to the caller instead of panic directly. (#343)
• Raft Engine will now triggers IO sync operation when rewritten bytes exceeded a threshold(512KiB by default), this can help avoiding too big sync impact the foreground write latency. (#347)

New Contributors

• @v01dstar made their first contribution in #343

Full Changelog: 0.4.1...0.4.2

0.4.1

What's Changed

Behavior Changes

• When log recycling is enabled, Raft Engine will now retain 50% more log files to reduce the chance of running out. (#331)
• Reduce the scope of keys reserved for internal use. (#335)

New Contributors

• @WenyXu made their first contribution in #335

Full Changelog: 0.4.0...0.4.1

0.4.0

What's Changed

Behavior Changes

• LogBatch::put returns a Result<()> instead of (). It errs when the key is reserved for internal use. (#290)
• Possible to specify a permission in FileSystem::open. (#296)
• Prometheus counter raft_engine_log_file_count no longer includes retired log files that are stashed for recycling. Those files are now tracked by a new counter raft_engine_recycled_file_count. (#297)

Bug Fixes

• Fix data loss caused by aborted rewrite operation. Downgrading to an earlier version without the fix may produce phantom Raft Groups or keys, i.e. never written but appear in queries. (#290)
• Fix a potential bug that an un-persisted log batch is mistakenly recovered and causes checksum mismatch error when being read later. (#319)

New Features

• Support preparing prefilled logs to enable log recycling when start-up. The amount of logs to prepare is controlled by Config::prefill_limit. (#278)
• Add a new configuration spill-dir to allow automatic placement of logs into an auxiliary directory when dir is full. (#294)
• Add a new method Engine::fork to duplicate an Engine to a new place, with a few disk file copies. (#296)
• Support configuring lz4 acceleration factor with compression-level. (#311)

New Contributors

• @MichaelScofield made their first contribution in #322

Full Changelog: 0.3.0...0.4.0

0.3.0

What's Changed

Bug Fixes

• Unconditionally tolerate fallocate failures as a fix to its portability issue. Errors other than EOPNOTSUPP will still emit a warning. (#225)
• Avoid leaving fractured write after failure by reseeking the file writer. Panic if the reseek fails as well. (#200)
• Fix a parallel recovery panic bug. (#251)
• Fix panic when an empty batch is written to engine and then reused. (#267)

New Features

• Add PerfContext which records detailed time breakdown of the write process to thread-local storage. (#227)
• Support recycling obsolete log files to reduce the cost of fallocate-ing new ones. (#224)

Public API Changes

• Add is_empty to Engine API. (#228)
• Add metadata deletion capability to FileSystem trait. Users can implement exists_metadata and delete_metadata to clean up obsolete metadata from older versions of Raft Engine. (#229)
• Add Engine::scan_messages and Engine::scan_raw_messages for iterating over written key-values. (#234)
• Add Engine::get for getting raw value. (#259)
• Move sync from env::WriteExt to env::Handle. (#269)
• Deprecate bytes_per_sync. (#269)

Behavior Changes

• Change format version to 2 from 1 by default. (#265)
• Enable log recycling by default. (#265)

New Contributors

• @Uchiha007 made their first contribution in #222
• @guoxiangCN made their first contribution in #242

Full Changelog: 0.2.0...0.3.0

0.2.2

What's Changed

Bug Fixes

• Avoid leaving fractured write after failure by reseeking the file writer. Panic if the reseek fails as well. (#245)
• Fix a parallel recovery panic bug. (#251)

Full Changelog: 0.2.1...0.2.2

0.2.1

What's Changed

Bug Fixes

• Unconditionally tolerate fallocate failures as a fix to its portability issue. Errors other than EOPNOTSUPP will still emit a warning. #226

Public API Changes

• Add metadata deletion capability to FileSystem trait. Users can implement exists_metadata and delete_metadata to clean up obsolete metadata from older versions of Raft Engine. #230

Full Changelog: 0.2.0...0.2.1

0.2.0

What's Changed

Bug Fixes

• Fix a false negative case of LogBatch::is_empty() #212
• Fix fsync ordering when rotating log file #219

New Features

• Support limiting the memory usage of Raft Engine under new feature swap #211
• Add a new Prometheus counter raft_engine_memory_usage to track memory usage #207

Improvements

• Reduce memory usage by 25% #206

Public API Changes

• Introduce a new error type Full #206
• LogBatch::merge returns a Result<()> instead of () #206

Full Changelog: 0.1.0...0.2.0

0.1.0

The first public release of Raft Engine. Now available on crates.io.

New Contributors

• @koushiro made their first contribution in #41
• @yuqi1129 made their first contribution in #102
• @ztelur made their first contribution in #163
• @PsiACE made their first contribution in #164

Full Changelog: https://github.com/tikv/raft-engine/commits/0.1.0