spark rdd how to flat Key - Array(value) pair

Question

I have a park paired rdd (key, Array(value1, value2, value3.....)). what scala statement should I wrote? How could I flat this rdd and creating a new rdd : (key, value1), (key, value2), (key, value3)....

Answer 1

As @moto said, it is simply

rdd.flatMapValues(v => v)

A more verbose but arguably more readable option:

rdd.flatMap {
   case (key, values) => values.map(v => key -> v)
}

Answer 2

rdd.flatMap{case (k,v) => v.map(vx => (k,vx))}