lmdb-rs

Idiomatic and safe APIs for interacting with the Symas Lightning Memory-Mapped Database (LMDB).

This repo is a fork of mozilla/lmdb-rs which is a fork of danburkert/lmdb-rs.

Why does it exist?

The sole reason why this crate exists is because it fixes a memory issue in LMDB where LMDB was keeping a lot of pages and not freeing them. So we decided to fork it and add a new MDB_ALWAYSFREEPAGES flag to the MDB_Env struct. This flag now forces LMDB to always free single pages instead of keeping them in a list for future reuse.

Vendoring

By default, if LMDB is installed on the system, this crate will attempt to make use of the system-available LMDB.

To force installation from source, build this crate with the vendored feature.

Building from Source

Using the system LMDB if available

git clone --recursive git@github.com:meilisearch/lmdb-rs.git
cd lmdb-rs
cargo build

Always vendoring

git clone --recursive git@github.com:meilisearch/lmdb-rs.git
cd lmdb-rs
cargo build --features vendored

Publishing to crates.io

To publish the lmdb-rkv-sys crate to crates.io:

git clone --recursive git@github.com:meilisearch/lmdb-rs.git
cd lmdb-rs/lmdb-sys
# Update the version string in lmdb-sys/Cargo.toml and lmdb-sys/src/lib.rs.
cargo publish
git tag lmdb-rkv-sys-$VERSION # where $VERSION is the updated version string
git push git@github.com:meilisearch/lmdb-rs.git --tags

To publish the lmdb-rkv crate to crates.io:

git clone --recursive git@github.com:meilisearch/lmdb-rs.git
cd lmdb-rs
# Update the version string in Cargo.toml and src/lib.rs and temporarily change
# the lmdb-rkv-sys dependency in Cargo.toml to the latest version on crates.io.
cargo publish
git tag $VERSION # where $VERSION is the updated version string
git push git@github.com:meilisearch/lmdb-rs.git --tags
# Change the lmdb-rkv-sys dependency in Cargo.toml back to a path dependency
# on the ./lmdb-sys directory.

Features

• lmdb-sys.
• Cursors.
• Zero-copy put API.
• Nested transactions.
• Database statistics.