When my tuple type includes a generic type parameter, the pair RDD
functions aren't available. Take for example the following (a join on two
RDDs, taking the sum of the values):
def joinTest(rddA: RDD[(String, Int)], rddB: RDD[(String, Int)]) :
RDD[(String, Int)] = {
rddA.join(rddB).map { case (k, (a, b)) => (k, a+b) }
}
That works fine, but lets say I replace the type of the key with a generic
type:
def joinTest[K](rddA: RDD[(K, Int)], rddB: RDD[(K, Int)]) : RDD[(K, Int)] =
{
rddA.join(rddB).map { case (k, (a, b)) => (k, a+b) }
}
This latter function gets the compiler error "value join is not a member of
org.apache.spark.rdd.RDD[(K, Int)]".
The reason is probably obvious, but I don't have much Scala experience. Can
anyone explain what I'm doing wrong?
--
Daniel Siegmann, Software Developer
Velos
Accelerating Machine Learning
440 NINTH AVENUE, 11TH FLOOR, NEW YORK, NY 10001
E: [email protected] W: www.velos.io
