lancedb-gatefixer[bot]
3956d9dbfa
## Summary - select rustls with native certificate roots explicitly for LanceDB's remote HTTP client - add a Linux regression test that rejects `libssl` or `libcrypto` dependencies in the built Python extension ## Root cause The Python remote client originally enabled reqwest's native TLS backend. During manylinux wheel repair, that caused OpenSSL 1.1 libraries to be bundled into the wheel. Loading those libraries on RHEL 9 with FIPS enabled aborts during the OpenSSL self-test before `import lancedb` can complete. LanceDB has since moved away from native TLS, but its own reqwest dependency relied on transitive rustls feature selection and the built extension had no regression guard. This change makes rustls selection explicit and tests the produced Linux native module's dynamic dependencies. ## Validation - `uv run --no-sync pytest python/tests/test_import.py -q` - `ruff format --check python` - `ruff check .` - `cargo fmt --all -- --check` - `cargo check --quiet --features remote --tests --examples` - `ldd python/lancedb/_lancedb.abi3.so` (no `libssl` or `libcrypto` dependency) - verified the resolved Python Rust dependency graph contains rustls and no `openssl-sys` or `native-tls` Fixes #1884 <!-- lance-gatekeeper-fix:v1 agent=31f916c7ac5c072bbbd54f3539d24f71 generation=1 --> Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>
LanceDB Python SDK
A Python library for LanceDB.
Installation
pip install lancedb
Pre-Haswell x86_64 hosts: lancedb-compat
The default lancedb wheel targets x86-64-haswell (AVX2 + FMA + F16C) for full performance on modern hardware. Pre-Haswell hosts — Intel Sandy Bridge / Ivy Bridge / Westmere; AMD Bulldozer / Piledriver / Steamroller — don't have AVX2 and crash with Illegal instruction at import lancedb.
For those hosts, install the lancedb-compat package instead:
pip install lancedb-compat
Same Python API (import lancedb works as usual). The compat wheel is compiled at the x86-64-v2 baseline (Nehalem-class) and uses runtime SIMD dispatch in the embedded lance crate to pick the right kernel tier (scalar / AVX / AVX+FMA / AVX2+FMA / AVX-512) at load time, so it still goes fast on modern hardware while running cleanly on the pre-Haswell silicon. Use lance.simd_info() from Python to verify which tier was selected.
lancedb and lancedb-compat install to the same lancedb/ namespace and conflict at install time. Pick one. To switch, pip uninstall lancedb first, then pip install lancedb-compat (or vice-versa).
If you need a custom baseline (or lancedb-compat isn't yet published for your platform), build from source with the override:
RUSTFLAGS="-C target-cpu=x86-64-v2" maturin build --release
pip install ./target/wheels/lancedb-*.whl
Preview Releases
Stable releases are created about every 2 weeks. For the latest features and bug fixes, you can install the preview release. These releases receive the same level of testing as stable releases, but are not guaranteed to be available for more than 6 months after they are released. Once your application is stable, we recommend switching to stable releases.
pip install --pre --extra-index-url https://pypi.fury.io/lancedb/ lancedb
Usage
Basic Example
import lancedb
db = lancedb.connect('<PATH_TO_LANCEDB_DATASET>')
table = db.open_table('my_table')
results = table.search([0.1, 0.3]).limit(20).to_list()
print(results)
Development
See CONTRIBUTING.md for information on how to contribute to LanceDB.