lancedb-gatefixer[bot] 11f24b1df4 fix: explain unsupported object storage mounts (#3823)
## Summary

- classify unsupported local-filesystem operations from Lance as a
NotSupported error
- explain that object-storage mounts cannot provide the safe commit
operations Lance requires and direct users to native object-store URIs
- preserve existing error behavior for other local I/O failures and
non-local backends

## Root cause

Mountpoint for Amazon S3 exposes an S3 bucket as a local path but does
not implement atomic rename. Lance uses atomic rename for safe local
commits, and the resulting unsupported I/O error was previously passed
through as a generic Lance error, leaving Python users with an opaque
low-level failure. Transparent support for such mounts is not safe;
direct s3:// access remains the supported path.

## Validation

- cargo test --quiet --features remote -p lancedb error::tests
- cargo test --quiet --features remote -p lancedb --lib (807 passed, 1
ignored)
- cargo check --quiet --features remote --tests --examples
- cargo clippy --quiet --features remote --tests --examples
- cargo fmt --all -- --check

Fixes #2016

<!-- lance-gatekeeper-fix:v1 agent=d53283c18fdb00a3a1b69448b1f40529
generation=1 -->

---------

Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>
2026-08-07 17:33:02 +08:00
2023-03-17 18:15:19 -07:00
2025-03-10 09:01:23 -07:00

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LanceDB is designed for fast, scalable, and production-ready vector search. It is built on top of the Lance columnar format. You can store, index, and search over petabytes of multimodal data and vectors with ease. LanceDB is a central location where developers can build, train and analyze their AI workloads.


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