How can I group pairRDD by keys and turn the values into RDD

问题

So what I have is RDD[(String, Int)] and I need to convert it into Map[String, RDD[Int]]

Ex.

My input looks like this:

RDD[("a", 1), ("a", 2), ("b", 1), ("c", 3)]

And the output I'm trying to get is:

Map["a" -> RDD[1, 2], "b" -> RDD[1], "c" -> RDD[3]]

Thanks in advance!

来源：https://stackoverflow.com/questions/48402479/how-can-i-group-pairrdd-by-keys-and-turn-the-values-into-rdd