Spark Quiz 3

what would be the type of dt  in the following code?
val data = Array(1, 2, 3, 4, 5)
val dt = sc.parallelize(data)

How many  SparkContext should be active per JVM

The shuffle is Spark’s mechanism for re-distributing data so that it’s grouped differently across partitions ?

which of the following Return a new distributed dataset formed by passing each element of the source through a function func

Which of the following will give you the number of items in mydf ?