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---
layout: global
title: Contributing to Spark
---
The Spark team welcomes contributions in the form of GitHub pull requests. Here are a few tips to get your contribution in:
- Break your work into small, single-purpose patches if possible. It's much harder to merge in a large change with a lot of disjoint features.
- Submit the patch as a GitHub pull request. For a tutorial, see the GitHub guides on [forking a repo](https://help.github.com/articles/fork-a-repo) and [sending a pull request](https://help.github.com/articles/using-pull-requests).
- Follow the style of the existing codebase. Specifically, we use [standard Scala style guide](http://docs.scala-lang.org/style/), but with the following changes:
* Maximum line length of 100 characters.
* Always import packages using absolute paths (e.g. `scala.collection.Map` instead of `collection.Map`).
* No "infix" syntax for methods other than operators. For example, don't write `table containsKey myKey`; replace it with `table.containsKey(myKey)`.
- Make sure that your code passes the unit tests. You can run the tests with `sbt/sbt test` in the root directory of Spark.
But first, make sure that you have [configured a spark-env.sh](configuration.html) with at least
`SCALA_HOME`, as some of the tests try to spawn subprocesses using this.
- Add new unit tests for your code. We use [ScalaTest](http://www.scalatest.org/) for testing. Just add a new Suite in `core/src/test`, or methods to an existing Suite.
- If you'd like to report a bug but don't have time to fix it, you can still post it to our [issues page](https://github.com/mesos/spark/issues), or email the [mailing list](http://www.spark-project.org/mailing-lists.html).
# Licensing of Contributions
Contributions via GitHub pull requests are gladly accepted from their original author. Along with any pull requests, please
state that the contribution is your original work and that you license the work to the project under the project's open source
license. *Whether or not you state this explicitly, by submitting any copyrighted material via pull request, email, or other
means you agree to license the material under the project's open source license and warrant that you have the legal authority
to do so.*
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