Hi I am new to Spark and I encountered this error when I try to map RDD[A] => RDD[Array[Double]] then collect the results.
A is a custom class extends Serializable. (Actually it's just a wrapper class which wraps a few variables that are all serializable). I also tried KryoSerializer according to this guide http://spark.apache.org/docs/0.8.1/tuning.html and it gave the same error message. Daniel Liu
