v0.22.1-nested-rtxns-5

heed & heed3

This release brings a new experimental functionality: the possibility to create multiple nested read transactions from an uncommitted write transaction. You can also examine another usage in the dedicated example file or in this Meilisearch pull request.

We are attempting to merge the necessary changes to upstream LMDB, but it will require additional work to ensure it produces correct C code. You can review the dedicated OpenLDAP tracking issue to see how it progresses. The latest version of the LMDB is more stable, without memory leaks, and is capable of correctly interacting with the dirty pages list.

// opening a write transaction
let mut wtxn = env.write_txn()?;

// [use the RwTxn to write into the env]

// opening multiple read-only transactions without committing beforehand
let rtxns = (0..1000).map(|_| env.nested_read_txn(&wtxn)).collect::<heed::Result<Vec<_>>>()?;

// [use the RoTxns and move them onto different threads]

v0.22.1-nested-rtxns-4

heed & heed3

This release brings a new experimental functionality: the possibility to create multiple nested read transactions from an uncommitted write transaction. You can also examine another usage in the dedicated example file or in this Meilisearch pull request.

We are attempting to merge the necessary changes to upstream LMDB, but it will require additional work to ensure it produces correct C code. You can review the dedicated OpenLDAP tracking issue to see how it progresses.

// opening a write transaction
let mut wtxn = env.write_txn()?;

// [use the RwTxn to write into the env]

// opening multiple read-only transactions without committing beforehand
let rtxns = (0..1000).map(|_| env.nested_read_txn(&wtxn)).collect::<heed::Result<Vec<_>>>()?;

// [use the RoTxns and move them onto different threads]

v0.22.1-nested-rtxns

heed & heed3

This release brings a new experimental functionality: the possibility to create multiple nested read transactions from an uncommitted write transaction. You can also examine another usage in the dedicated example file or in this Meilisearch pull request.

We are attempting to merge the necessary changes to upstream LMDB, but it will require additional work to ensure it produces correct C code. You can review the dedicated OpenLDAP tracking issue to see how it progresses.

// opening a write transaction
let mut wtxn = env.write_txn()?;

// [use the RwTxn to write into the env]

// opening multiple read-only transactions without committing beforehand
let rtxns = (0..1000).map(|_| env.nested_read_txn(&wtxn)).collect::<heed::Result<Vec<_>>>()?;

// [use the RoTxns and move them onto different threads]

v0.22.0

heed & heed3

This release brings better-polished support for the heed/heed3 duality. It also improves the documentation, adds support for custom duplicate sort comparators, supports the PREV_SNAPSHOT flag, better support for Thread Local Storage (TLS)-backed of transactions, and bumps LMDB to the latest patch.

What's Changed

• Combined version of LMDB mdb.master and mdb.master3 by @Kerollmops in #278
• Upgrade dependencies by @Kerollmops in #295, #304, #320, and #303
• List the examples in the Cargo tomls by @Kerollmops in #298
• Parametric TLS for read transactions by @Kerollmops in #300
• Fix the MDB_NOTLS documentation by @Kerollmops in #302
• Update license for 2025 by @meili-bot in #305
• Bump LMDB commit, use GitLab for LMDB and improve the build script by @Kerollmops in #310 and #311
• Break and improve the Env::copy_to_file method by @Kerollmops in #312
• Introduce the PREV_SNAPSHOT flag by @irevoire in #296
• Rename FIXED_MAP flag name by @Kerollmops in #313
• Expose USE_VALGRIND compilation flag as use-valgrind feature by @dureuill in #288
• Introduce AnyTls by @dureuill in #315
• Show ranges of slice in the doc by @Kerollmops in #318
• More Env parameter accessors by @Kerollmops in #321
• Setting NDEBUG on release builds by @Kerollmops in #324
• Bump -sys crates and heed/heed3 versions by @Kerollmops in #325
• Introduce the Env::copy_to_path method by @Kerollmops in #326
• Make the Env<WithTls> the default by @Kerollmops in #327
• Add Dup Sort Custom Comparator support by @Kerollmops and @oXtxNt9U in #319

Full Changelog: v0.21.0...v0.22.0

v0.21.0 🗝

heed & heed3

This release introduces the first wrapper around the mdb.master3 LMDB branch, which features encryption at rest. You can use the new heed3 crate to read and write data encrypted on disk and decrypted on demand.

What's Changed

• Make the RoTxn covariant and keep it !Sync by @Kerollmops in #285
• Relax the HeedDecode bound on Lazy::remap by @irevoire in #287
• add custom ordering support to range types by @Boog900 in #289

New Contributors

• @Boog900 made their first contribution in #289

Full Changelog: v0.20.5...v0.21.0

v0.20.5 🛁

heed

What's Changed

• fix function docs (clippy warnings) by @antonilol in #273
• fix custom_key_cmp_wrapper being able to unwind to C code (ub) by @antonilol in #275

New Contributors

• @antonilol made their first contribution in #273

v0.20.4 🛁

heed

What's Changed

• Use features that actually exists by @Kerollmops in #270
• Bump lmdb submodules commit by @zanaviska in #269

New Contributors

• @zanaviska made their first contribution in #269

v0.20.3 🛁

heed

What's Changed

• Update dependencies by @irevoire in #265

v0.20.2 🛁

heed

What's Changed

• Introduce the longer-keys feature which sets -DMDB_MAXKEYSIZE=0 by @tpunder in #263
• Bump the internal LMDB version to v0.9.33 by @Kerollmops in #264

New Contributors

• @tpunder made their first contribution in #263

v0.20.1 🛁

heed

What's Changed

• Close the p tag by @Kerollmops in #250
• replace all FnMut with FnOnce in put_reserve_* by @nolanderc in #251
• Add Database::get_or_put: insert if value does not exist, otherwise return previous value by @nolanderc in #252
• make ReservedSpace more flexible by @nolanderc in #256
• add lifetime to ReservedSpace (closes #258) by @nolanderc in #259
• Improve performance of ReservedSpace by @nolanderc in #260
• enable self referential rtxn by @irevoire in #261

New Contributors

• @nolanderc made their first contribution in #251