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How to contribute

We definitely welcome your patches and contributions to gRPC! Please read the gRPC organization's governance rules and contribution guidelines before proceeding.

If you are new to github, please start by reading Pull Request howto

Legal requirements

In order to protect both you and ourselves, you will need to sign the Contributor License Agreement. When you make a PR, a CLA bot will provide a link for the process.

Compiling

See COMPILING.md. Specifically, you'll generally want to set skipCodegen=true so you don't need to deal with the C++ compilation.

Code style

We follow the Google Java Style Guide. Our build automatically will provide warnings for style issues. Eclipse and IntelliJ style configurations are commonly useful. For IntelliJ 14, copy the style to ~/.IdeaIC14/config/codestyles/, start IntelliJ, go to File > Settings > Code Style, and set the Scheme to GoogleStyle.

Guidelines for Pull Requests

How to get your contributions merged smoothly and quickly.

Create small PRs that are narrowly focused on addressing a single concern. We often times receive PRs that are trying to fix several things at a time, but only one fix is considered acceptable, nothing gets merged and both author's & review's time is wasted. Create more PRs to address different concerns and everyone will be happy.
For speculative changes, consider opening an issue and discussing it to avoid wasting time on an inappropriate approach. If you are suggesting a behavioral or API change, consider starting with a gRFC proposal.
Follow typical Git commit message structure. Have a good commit description as a record of what and why the change is being made. Link to a GitHub issue if it exists. The commit description makes a good PR description and is auto-copied by GitHub if you have a single commit when creating the PR.

If your change is mostly for a single module (e.g., other module changes are trivial), prefix your commit summary with the module name changed. Instead of "Add HTTP/2 faster-than-light support to gRPC Netty" it is more terse as "netty: Add faster-than-light support".
Don't fix code style and formatting unless you are already changing that line to address an issue. If you do want to fix formatting or style, do that in a separate PR.
Unless your PR is trivial, you should expect there will be reviewer comments that you'll need to address before merging. Address comments with additional commits so the reviewer can review just the changes; do not squash reviewed commits unless the reviewer agrees. PRs are squashed when merging.
Keep your PR up to date with upstream/master (if there are merge conflicts, we can't really merge your change).
All tests need to be passing before your change can be merged. We recommend you run tests locally before creating your PR to catch breakages early on. Also, ./gradlew build (gradlew build on Windows) must not introduce any new warnings.
Exceptions to the rules can be made if there's a compelling reason for doing so.