网站介绍：文章浏览阅读427次。1、join 的使用将一组数据转化为RDD后，分别创造出两个PairRDD，然后再对两个PairRDD进行归约（即合并相同Key对应的Value），元素集合1: {(1, 1), (2, 4), (3, 9), (4, 16), (5, 25)}元素集合2: {(1, A), (2, D), (3, I), (4, P), (5, Y)}集合1和集合2进行join:{(1, (1, A)), (2, (4, D)), (3, (9, I)), (4, (16, P)), (5, (25._org.apache.spark.api.java.function.function in instance of org.apache.spark.
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