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Release process

There are five total packages we release. Four are the lancedb packages for Python, Rust, Java, and Node.js. The other one is the legacy vectordb package node.js.

The Python package is versioned and released separately from the Rust, Java, and Node.js ones. For Node.js the release process is shared between lancedb and vectordb for now.

Preview releases

LanceDB has full releases about every 2 weeks, but in between we make frequent preview releases. These are released as 0.x.y.betaN versions. They receive the same level of testing as normal releases and let you get access to the latest features. However, we do not guarantee that preview releases will be available more than 6 months after they are released. We may delete the preview releases from the packaging index after a while. Once your application is stable, we recommend switching to full releases, which will never be removed from package indexes.

Making releases

The release process uses a handful of GitHub actions to automate the process.

  ┌─────────────────────┐
  │Create Release Commit│
  └─┬───────────────────┘
    │                           ┌────────────┐ ┌──►Python GH Release
    ├──►(tag) python-vX.Y.Z ───►│PyPI Publish├─┤
    │                           └────────────┘ └──►Python Wheels
    │
    │                           ┌───────────┐
    └──►(tag) vX.Y.Z ───┬──────►│NPM Publish├──┬──►Rust/Node GH Release
                        │       └───────────┘  │
                        │                      └──►NPM Packages
                        │       ┌─────────────┐
                        ├──────►│Cargo Publish├───►Cargo Release
                        │       └─────────────┘
                        │       ┌─────────────┐
                        └──────►│Maven Publish├───►Java Maven Repo Release
                                └─────────────┘

To start a release, trigger a Create Release Commit action from the workflows page (Click on "Run workflow").

  • For a preview release, leave the default parameters.
  • For a stable release, set the release_type input to stable.

Important

If there was a breaking change since the last stable release, and we haven't done so yet, we should increment the minor version. The CI will detect if this is needed and fail the Create Release Commit job. To fix, select the "bump minor version" option.

Breaking changes

We try to avoid breaking changes, but sometimes they are necessary. When there are breaking changes, we will increment the minor version. (This is valid semantic versioning because we are still in 0.x versions.)

When a PR makes a breaking change, the PR author should mark the PR using the conventional commit markers: either exclamation mark after the type (such as feat!: change signature of func) or have BREAKING CHANGE in the body of the PR. A CI job will add a breaking-change label to the PR, which is what will ultimately be used to CI to determine if the minor version should be incremented.

Important

Reviewers should check that PRs with breaking changes receive the breaking-change label. If a PR is missing the label, please add it, even if after it was merged. This label is used in the release process.

Some things that are considered breaking changes:

  • Upgrading lance to a new minor version. Minor version bumps in Lance are considered breaking changes during 0.x releases. This can change behavior in LanceDB.
  • Upgrading a dependency pin that is in the Rust API. In particular, upgrading DataFusion and Arrow are breaking changes. Changing dependencies that are not exposed in our public API are not considered breaking changes.
  • Changing the signature of a public function or method.
  • Removing a public function or method.

We do make exceptions for APIs that are marked as experimental. These are APIs that are under active development and not in major use. These changes should not receive the breaking-change label.