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zapdb/CHANGELOG.md
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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Serialization Versioning.

Unreleased

1.6.2 - 2020-09-10

Fixed

  • Fix Sequence generates duplicate values (#1281)
  • Ensure bitValuePointer flag is cleared for LSM entry values written to LSM (#1313)
  • Confirm badgerMove entry required before rewrite (#1302)
  • Drop move keys when its key prefix is dropped (#1331)
  • Compaction: Expired keys and delete markers are never purged (#1354)
  • Restore: Account for value size as well (#1358)
  • GC: Consider size of value while rewriting (#1357)
  • Rework DB.DropPrefix (#1381)
  • Update head while replaying value log (#1372)
  • Remove vlog file if bootstrap, syncDir or mmap fails (#1434)
  • Levels: Compaction incorrectly drops some delete markers (#1422)
  • Fix(replay) - Update head for LSM entries also (#1456)
  • Fix(Backup/Restore): Keep all versions (#1462)
  • Fix build on Plan 9 (#1451)

1.6.1 - 2020-03-26

New APIs

  • Badger.DB
    • NewWriteBatchAt (#948)
  • Badger.Options
    • WithEventLogging (#1035)
    • WithVerifyValueChecksum (#1052)
    • WithBypassLockGuard (#1243)

Features

  • Support checksum verification for values read from vlog (#1052)
  • Add EventLogging option (#1035)
  • Support WriteBatch API in managed mode (#948)
  • Add support for watching nil prefix in Subscribe API (#1246)

Fixed

  • Initialize vlog before starting compactions in db.Open (#1226)
  • Fix int overflow for 32bit (#1216)
  • Remove the 'this entry should've caught' log from value.go (#1170)
  • Fix merge iterator duplicates issue (#1157)
  • Fix segmentation fault in vlog.Read (header.Decode) (#1150)
  • Fix VerifyValueChecksum checks (#1138)
  • Fix windows dataloss issue (#1134)
  • Fix request increment ref bug (#1121)
  • Limit manifest's change set size (#1119)
  • Fix deadlock in discard stats (#1070)
  • Acquire lock before unmapping vlog files (#1050)
  • Set move key's expiresAt for keys with TTL (#1006)
  • Fix deadlock when flushing discard stats. (#976)
  • Fix table.Smallest/Biggest and iterator Prefix bug (#997)
  • Fix boundaries on GC batch size (#987)
  • Lock log file before munmap (#949)
  • VlogSize to store correct directory name to expvar.Map (#956)
  • Fix transaction too big issue in restore (#957)
  • Fix race condition in updateDiscardStats (#973)
  • Cast results of len to uint32 to fix compilation in i386 arch. (#961)
  • Drop discard stats if we can't unmarshal it (#936)
  • Open all vlog files in RDWR mode (#923)
  • Fix race condition in flushDiscardStats function (#921)
  • Ensure rewrite in vlog is within transactional limits (#911)
  • Fix prefix bug in key iterator and allow all versions (#950)
  • Fix discard stats moved by GC bug (#929)

Performance

  • Use fastRand instead of locked-rand in skiplist (#1173)
  • Fix checkOverlap in compaction (#1166)
  • Optimize createTable in stream_writer.go (#1132)
  • Add capacity to slice creation when capacity is known (#1103)
  • Introduce fast merge iterator (#1080)
  • Introduce StreamDone in Stream Writer (#1061)
  • Flush vlog buffer if it grows beyond threshold (#1067)
  • Binary search based table picker (#983)
  • Making the stream writer APIs goroutine-safe (#959)
  • Replace FarmHash with AESHash for Oracle conflicts (#952)
  • Change file picking strategy in compaction (#894)
  • Use trie for prefix matching (#851)
  • Fix busy-wait loop in Watermark (#920)

1.6.0 - 2019-07-01

This is a release including almost 200 commits, so expect many changes - some of them not backward compatible.

Regarding backward compatibility in Badger versions, you might be interested on reading VERSIONING.md.

Note: The hashes in parentheses correspond to the commits that impacted the given feature.

New APIs

Modified APIs

Breaking changes:

  • badger.DefaultOptions and badger.LSMOnlyOptions are now functions rather than variables (91ce687)
  • badger.Item.Value now receives a function that returns an error (439fd46)
  • badger.Txn.Commit doesn't receive any params now (6daccf9)
  • badger.DB.Tables now receives a boolean (76b5341)

Not breaking changes:

  • badger.LSMOptions changed values (799c33f)
  • badger.DB.NewIterator now allows multiple iterators per RO txn (41d9656)
  • badger.Options.TableLoadingMode's new default is options.MemoryMap (6b97bac)

Removed APIs

Tools:

1.5.5 - 2019-06-20

  • Introduce support for Go Modules

1.5.3 - 2018-07-11

Bug Fixes:

  • Fix a panic caused due to item.vptr not copying over vs.Value, when looking for a move key.

1.5.2 - 2018-06-19

Bug Fixes:

  • Fix the way move key gets generated.

  • If a transaction has unclosed, or multiple iterators running simultaneously, throw a panic. Every iterator must be properly closed. At any point in time, only one iterator per transaction can be running. This is to avoid bugs in a transaction data structure which is thread unsafe.

  • Warning: This change might cause panics in user code. Fix is to properly close your iterators, and only have one running at a time per transaction.

1.5.1 - 2018-06-04

Bug Fixes:

Cleanup:

  • Clarify comments and documentation.
  • Move badger tool one directory level up.

1.5.0 - 2018-05-08

  • Introduce NumVersionsToKeep option. This option is used to discard many versions of the same key, which saves space.
  • Add a new SetWithDiscard method, which would indicate that all the older versions of the key are now invalid. Those versions would be discarded during compactions.
  • Value log GC moves are now bound to another keyspace to ensure latest versions of data are always at the top in LSM tree.
  • Introduce ValueLogMaxEntries to restrict the number of key-value pairs per value log file. This helps bound the time it takes to garbage collect one file.

1.4.0 - 2018-05-04

  • Make mmap-ing of value log optional.
  • Run GC multiple times, based on recorded discard statistics.
  • Add MergeOperator.
  • Force compact L0 on clsoe (#439).
  • Add truncate option to warn about data loss (#452).
  • Discard key versions during compaction (#464).
  • Introduce new LSMOnlyOptions, to make Badger act like a typical LSM based DB.

Bug fix:

  • (Temporary) Check max version across all tables in Get (removed in next release).
  • Update commit and read ts while loading from backup.
  • Ensure all transaction entries are part of the same value log file.
  • On commit, run unlock callbacks before doing writes (#413).
  • Wait for goroutines to finish before closing iterators (#421).

1.3.0 - 2017-12-12

  • Add DB.NextSequence() method to generate monotonically increasing integer sequences.
  • Add DB.Size() method to return the size of LSM and value log files.
  • Tweaked mmap code to make Windows 32-bit builds work.
  • Tweaked build tags on some files to make iOS builds work.
  • Fix DB.PurgeOlderVersions() to not violate some constraints.

1.2.0 - 2017-11-30

  • Expose a Txn.SetEntry() method to allow setting the key-value pair and all the metadata at the same time.

1.1.1 - 2017-11-28

  • Fix bug where txn.Get was returing key deleted in same transaction.
  • Fix race condition while decrementing reference in oracle.
  • Update doneCommit in the callback for CommitAsync.
  • Iterator see writes of current txn.

1.1.0 - 2017-11-13

  • Create Badger directory if it does not exist when badger.Open is called.
  • Added Item.ValueCopy() to avoid deadlocks in long-running iterations
  • Fixed 64-bit alignment issues to make Badger run on Arm v7

1.0.1 - 2017-11-06

  • Fix an uint16 overflow when resizing key slice
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