Reference:
Python Spark (pyspark) Programming Guide
https://spark.apache.org/docs/0.9.2/api/pyspark/index.html
Spark Streaming
https://spark.apache.org/docs/0.9.2/streaming-programming-guide.html
Machine Learning Library (MLlib)
https://spark.apache.org/docs/0.9.2/mllib-guide.html
GraphX
https://spark.apache.org/docs/0.9.2/graphx-programming-guide.html
Bagel
https://spark.apache.org/docs/0.9.2/bagel-programming-guide.html