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CHANGELOG.md

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Change log

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

Unreleased

Removed

  • [tivk] BREAKING The raw max batch put size dsn query parameter tikv_raw_max_batch_put_size=<value> has been removed (the tikv-client/v2 keeps it private now).
  • [tivk] BREAKING The raw batch pair count dsn query parameter tikv_raw_batch_pair_count=<value> has been removed (the tikv-client/v2 keeps it private now).

Changed

  • [tivk] BREAKING Upgraded to tikv-client/v2 version, this currently requires TiKV version 5.0.0+.
  • [tivk] BREAKING The raw max scan limit dsn query parameter tikv_raw_max_scan_limit=<value> now applies globally to all instances. This means if in the use application, multiple DSN for TiKV are provided, the last one with tikv_raw_max_scan_limit wins.

Added

  • [common] Calling Iterator.Err() without ever having called Iterator.Next() is now an error.
  • [badger] Added support for using WithTruncate option on Badger to delete not persisted data on starting by adding truncate=true param to DSN url (i.e. badger:///path?truncate=true)
  • [badger] Added support for switching to ZSTD compression instead of Snappy by providing compression=zstd param to DSN url (i.e. badger:///path?compression=zstd)

[v0.1.0]

Fixed

  • [tikv] Fixed store.BatchDelete not deleting keys correctly, it was not prefixing the key with the table.
  • [badger] Fixed error propagation when dealing with WriteBatch transaction, only ErrTxnTooBig was checked, now any error is propagated.
  • [tikv] Fixed store.Scan not returning more than 10561 rows.
  • [tikv] Fixed invalid store.ErrNotFound being thrown when store.WithEmptyValue is used and the value stored is empty.
  • [tikv] Fixed store.WithEmptyValue support when using compression that was not compressing the "formatted" value that should have been sent to TiKV.

Changed

  • [core] Now supporting key-only iteration for BatchPrefix, Prefix and Scan calls.
  • [core] BREAKING Added options ...store.ReadOption options to store.KVStore#BatchPrefix.
  • [core] BREAKING Added options ...store.ReadOption options to store.KVStore#Prefix.
  • [core] BREAKING Added options ...store.ReadOption options to store.KVStore#Scan.
  • [badger] Improved implementation of Prefix by reducing number of internal shards Badger is going to check when doing the prefix search.
  • [tikv] Improved implementation of Prefix and BatchPrefix by using TiKV client raw max scan limit value to iterate.
  • [tikv] Added ability to customize TiKV client raw max scan limit using tikv_raw_max_scan_limit=<value> query parameter in dsn (accepts positive numbers).
  • [tikv] Added ability to customize TiKV client raw max batch put size using tikv_raw_max_batch_put_size=<value> query parameter in dsn (accepts positive numbers).
  • [tikv] Added ability to customize TiKV client raw batch pair count using tikv_raw_batch_pair_count=<value> query parameter in dsn (accepts positive numbers).
  • [tikv] Re-implemented store.BatchGet using native TiKV client BatchGet.
  • [tikv] Changed batch size threshold default value to 7MiB, the idea is to reduce the chance that the batch reach this value.
  • [tikv] Added ability to customize batch time threshold by using batch_time_threshold=<value> query parameter in dsn (accepts time.Duration string formats).
  • [tikv] Added ability to customize batch ops threshold by using batch_ops_threshold=<value> query parameter in dsn (accepts positive numbers).
  • [tikv] Added ability to customize batch size threshold by using batch_size_threshold=<value> query parameter in dsn (accepts positive numbers).
  • [tikv] Added ability to customize compression size threshold by using compression_size_threshold=<value> query parameter in dsn (accepts positive numbers).
  • [tikv] Re-added support for compression to overcome issue where single element are bigger than 8MB. This is now an opt-in feature, to activate, use compression=zstd query parameter in dsn.
  • [tikv] Default batch size threshold is now 8MiB, which is the default max raft entry size in TiKV.
  • [core] BREAKING Renamed store.BachOp to store.BatchOp (fixed typo in Bach).
  • [core] Added Close method on store.KVStore.

[v0.0.1]

Changed

  • [core] Added BatchPrefix method on store.KVStore. It's now possible to perform multiple prefix scan on a single batch. Driver not supporting natively the functionality degrades to a sequential call to standard prefix capabilities.
  • [core] BREAKING Added limit options to store.KVStore#Prefix.
  • [core] BREAKING Function store.Iterator#Next return's type is now store.KV, previously *store.KV.
  • [core] BREAKING Function store.Iterator#PushItem item argument's type is now store.KV, previously *store.KV.
  • [tikv] Added 'OptionEmptyValueEnable' to let the driver simulate empty values by adding a little byte to every row
  • BREAKING Removed explicit compression (just use built-in from each db), only kept within badger for backward-compatibility

Improved

  • [core] Reduced memory allocations when receiving items from iterators.
  • [badger] Improved performance of Scan in presence of small limit value.
  • [bigkv] Improved performance of BatchGet which was sequential instead of using BigTable ReadRows call which is batched.

Fixed

  • [badger] Fixed returning proper store.NotFoundErrors on 'BatchGet'

[pre-open-sourcing]

Changed

  • The GetTransactionEvents family of functions that take a transaction ID prefix, NOW REQUIRE a prefix that is an even number of hex characters (as they are converted to bytes and compared on bytes). They cannot be compared on half a byte (which a single hex character represents). Sanitization must happen before calling this library, or those calls will panic.

  • License changed to Apache 2.0