Get help using Spark or contribute to the project on our mailing lists:
The StackOverflow tag
apache-spark is an unofficial but active forum for Spark users' questions and answers.
Spark Meetups are grass-roots events organized and hosted by leaders and champions in the community around the world. Check out http://spark.meetup.com to find a Spark meetup in your part of the world. Below is a partial list of Spark meetups.
If you'd like your meetup added, email email@example.com.
The project tracks bugs and new features on JIRA. If you'd like, you can also subscribe to firstname.lastname@example.org to receive emails about new issues, and email@example.com to get emails about commits.
Our wiki has a list of projects and organizations powered by Spark.
After being released, Spark grew a developer community on GitHub and moved to Apache in 2013. A wide range of contributors now develop the project (over 400 developers from 100 companies).