is sorting necessary after join of sorted RDD

[Adrian Mocanu]

Is sorting necessary after a join on 2 sorted RDD?

Example:
val stream1= mystream.transform(rdd=>rdd.sortByKey(true))
val stream2= mystream.transform(rdd=>rdd.sortByKey(true))
val stream3= stream1.join(stream2)

Will stream3 be ordered?

-Adrian