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How to Contribute

We're excited you're interested in contributing to Marquez! We'd love your help, and there are plenty of ways to contribute:

  • Give the repo a star
  • Join our slack channel and leave us feedback or help with answering questions from the community
  • Fix or report a bug
  • Fix or improve documentation
  • For newcomers, pick up a "good first issue", then send a pull request our way (see the resources section below for helpful links to get started)

We feel that a welcoming community is important and we ask that you follow the Contributor Covenant Code of Conduct in all interactions with the community.

If you’re interested in using or learning more about Marquez, reach out to us on our slack channel and follow @MarquezProject for updates. We also encourage new comers to join our monthly community meeting!

Getting Your Changes Approved

Your pull request must be approved and merged by a committer.

Development

To run the entire test suite:

$ ./gradlew test

You can also run individual tests for a submodule using the --tests flag:

$ ./gradlew :api:test --tests marquez.api.OpenLineageResourceTest
$ ./gradlew :api:test --tests marquez.service.OpenLineageServiceIntegrationTest
$ ./gradlew :api:test --tests marquez.db.OpenLineageDaoTest

Or run tests by category:

$ ./gradlew :api:testUnit         # run only unit tests
$ ./gradlew :api:testIntegration  # run only integration tests
$ ./gradlew :api:testDataAccess   # run only data access tests

We use spotless to format our code. This ensures .java files are formatted to comply with Google Java Style. Make sure your code is formatted before pushing any changes, otherwise CI will fail:

$ ./gradlew spotlessApply

Note: To make formatting code simple, we recommend installing a plugin for your favorite IDE. We also use Lombok. Though not required, you might want to install the plugin, as well.

.git/hooks

We use pre-commit to manage git hooks:

$ brew install pre-commit

To setup the git hook scripts run:

$ pre-commit install

.github/workflows

Each Pull Request executes a series of quality checks, mostly relying upon CircleCI for validation. However, there are certain validation checks that execute via GitHub Actions and can be run locally using the steps below.

Install act and run the following command, which will evaluate the GitHub Actions checks that apply to each Pull Request. The first time you run act you will be asked to choose a runner.

Alternatively, you can store your preferred runner within a local user profile named .actrc.

# .actrc file example (https://github.com/nektos/act#configuration)
-P ubuntu-latest=ghcr.io/catthehacker/ubuntu:act-latest

Once you have configured a runner, use act to invoke GitHub Actions and evaluate the workflow.

act pull_request

You can also enable verbose logging and image caching via act flags.

act pull_request --reuse --verbose

Note: Docker must be running in order to utilize act.

Troubleshooting

There is an issue within the act tool that prevents the kind cluster from being deleted after execution of the action. When this condition exists, you will experience the error below.

| Creating kind cluster...
| ERROR: failed to create cluster: node(s) already exist for a cluster with the name "chart-testing"
[Lint and Test Chart/lint-test]   ❌  Failure - Create kind cluster

Execute the command below to manually clean up the kind cluster and resolve the problem.

kind delete clusters chart-testing

Publish to Local Maven Repository

Use publishToMavenLocal to publish artifacts to your local maven repository:

$ ./gradlew publishToMavenLocal

Submitting a Pull Request

  1. Fork and clone the repository
  2. Make sure all tests pass locally: ./gradlew :api:test
  3. Create a new branch: git checkout -b feature/my-cool-new-feature
  4. Make a change on your cool new branch
  5. Write a test for your change
  6. Make sure .java files are formatted: ./gradlew spotlessJavaCheck
  7. Make sure .java files contain a copyright and license header
  8. Make sure to sign you work
  9. Push the change to your fork and submit a pull request
  10. Work with project maintainers to get your change reviewed and merged into the main branch
  11. Delete your branch

To ensure your pull request is accepted, follow these guidelines:

Note: A pull request should generally contain only one commit (use git commit --amend and git push --force or squash existing commits into one).

Branching

  • Use a group at the beginning of your branch names:

    feature  Add or expand a feature
bug      Fix a bug
proposal Propose a change

    For example:

    feature/my-cool-new-feature
bug/my-bug-fix
bug/my-other-bug-fix
proposal/my-proposal

  • Choose short and descriptive branch names

  • Use dashes (-) to separate words in branch names

  • Use lowercase in branch names

Dependencies

We use renovate to manage dependencies for most of our project modules, with a couple of exceptions. Renovate automatically detects new dependency versions and opens pull requests to upgrade dependencies in accordance with the configured rules.

The following dependencies are managed manually:

  • Web code - it is challenging to programmatically validate web content
  • Spark versions - the internal query plans parsed by the Spark OpenLineage integration are not stable across Spark versions
  • Gradle - this tool orchestrates the entire build pipeline and was excluded to ensure stability

Sign Your Work

The sign-off is a simple line at the end of the message for a commit. All commits need to be signed. Your signature certifies that you wrote the patch or otherwise have the right to contribute the material (see Developer Certificate of Origin):

This is my commit message

Signed-off-by: Remedios Moscote <remedios.moscote@buendía.com>

Git has a -s command line option to append this automatically to your commit message:

$ git commit -s -m "This is my commit message"

API Docs

To bundle:

$ redoc-cli bundle spec/openapi.yml -o docs/openapi.html  --title "Marquez API Reference"

To serve:

$ redoc-cli serve spec/openapi.yml

Then browse to: http://localhost:8080

Note: To bundle or serve the API docs, please install redoc-cli.

COPYRIGHT / LICENSE

We use SPDX for copyright and license information. The following license header must be included in all java, bash, and py source files:

java

/*
 * Copyright 2018-2022 contributors to the Marquez project
 * SPDX-License-Identifier: Apache-2.0
 */

bash

#!/bin/bash
#
# Copyright 2018-2022 contributors to the Marquez project
# SPDX-License-Identifier: Apache-2.0

py

# Copyright 2018-2022 contributors to the Marquez project
# SPDX-License-Identifier: Apache-2.0

Resources

SPDX-License-Identifier: Apache-2.0 Copyright 2018-2023 contributors to the Marquez project.