0.6.0

• Return Err instead of panic'ing when opening a database file with an incompatible file format version
• Many optimizations to the file format, and progress toward stabilizing it
• Fix race between read & write transactions, which could cause reads to return corrupted data
• Better document the different WriteStrategys
• Fix panic when recovering a database that was uncleanly shutdown, which had been created with WriteStrategy::Checksum (which is the default)
• Fix panic when using insert_reserve() in certain cases

0.5.0

Major features

Optimize MultimapTable storage format to use O(k * log(n_k) + v * log(n_v / n_k)) space instead of O(k * log(n_k + n_v) + v * log(n_k + n_v)) space, where k is the size of the stored keys, v is the size of the stored values, n_k is the number of stored keys, n_v is the number of stored values

Minor features

• Add support for the unit type, (), as a value
• Change MultimapTable::range to return an iterator of key-value-collection pairs, instead of key-value pairs
• Automatically abort WriteTransaction on drop
• Return an error when attempting to open the same database file for writing in multiple locations, concurrently

Fixes

• Fix compilation errors for 32bit x86 targets
• More robust handling of fsync failures

0.4.0

• Add single phase with checksum commit strategy. This is now the default and reduces commit latency by ~2x. For more details, see the design doc and blog post. The previous behavior is available via WriteStrategy::Throughput, and can have better performance when writing a large number of bytes per transaction.

0.3.1

• Fix a bug where re-opening a Table during a WriteTransaction lead to stale results being read

0.3.0

• Fix a serious data corruption issue that caused many write operations to corrupt the database
• Make redb region size configurable
• Implement garbage collection of empty regions
• Fixes and optimizations to make the file format more efficient

0.2.0

• Add information log messages which can be enabled with the logging feature
• Add support for [u8; N] type
• Optimize storage of fixed width types. The value length is no longer stored, which reduces storage space by ~50% for u64,
  2x for u32, and also improves performance.

0.1.2

• Change insert() to return an Option<V> with the previous value, instead of ()

0.1.1

• Improved documentation

0.1.0

• Initial beta release