datastax/spark-cassandra-connector — pull request #373 by critikaled (2014-10-28 14:52:06+00:00)
Title: Make  SparkContextFunctions Serializable or implicits will make the spark context useless inside rdds!!

To make it Serializable
take a look at this http://stackoverflow.com/questions/23737804/enriching-sparkcontext-without-incurring-in-serialization-issues