Greetings!
For me, the code below fails from the shell.However, I can do essentially the 
same from compiled code, exporting the jar.
If I use default serialization or kryo with reference tracking, the error 
message tells me it can't find the constructor for "A".If I use kryo with 
reference tracking, I get a stack overflow.
I'm using Spark 1.2.1 on AWS EMR (hadoop 2.4).
I've also tried putting this code inside an object.
Is this just me?  Am I overlooking something obvious?
Thanks!
-Mike
:paste
sealed class AorBcase class A(i: Int) extends AorBcase class B(i: Int, j: Int) 
extends AorB
sc.parallelize(0.until(1)).map{ _ =>    val x = A(1)    x}.collect()

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