R interface for Apache Spark

Great tool, which allows you to use advantages of Apache Spark and R functionality (with RStudio). 

http://spark.rstudio.com/index.html

Apache Spark 1.5. What's new?

Apache Spark 1.5 presented by Databricks co-founder Patrick Wendell from Databricks

Spark for Data Science

In June you can learn with EdX "how to apply data science techniques using parallel programming in Apache Spark to explore big (and small) data". It will be "Introduction to Big Data with Apache Spark" course from Berkeley.

What is Spark?

Here you can read a bit old, but great article from IBM Developers.