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layout: global
title: How to Contribute to Spark
---
# 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)`.
- Add unit tests to your new 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]]. Also, feel free to email
the [[mailing list|http://www.spark-project.org/mailing-lists.html]].