combining two RDDs by values in scala spark

Question

I have two RDDs.

rdd1 = (string, integer)

(a, 10)
(b, 15)
(c, 20)
(d, 20)
(e, 13)

rdd2 = (string, string)

(1, a)
(2, b)
(3, e)

When some of rdd2's values are the same with rdd1's keys, how can I merge them like below? Is it possible?

(1, 10)
(2, 15)
(3, 13)

Answer 1

Try:

rdd1.join(rdd2.map(_.swap)).values