Spark函数讲解：collectAsMap

/**
* User: 过往记忆
* Date: 15-03-16
* Time: 上午09:24
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scala> val data = sc.parallelize(List((1, "www"), (1, "iteblog"), (1, "com"),
　　　　(2, "bbs"), (2, "iteblog"), (2, "com"), (3, "good")))
data: org.apache.spark.rdd.RDD[(Int, String)] =
　　　　ParallelCollectionRDD[26] at parallelize at <console>:12

scala> data.collectAsMap
res28: scala.collection.Map[Int,String] = Map(2 -> com, 1 -> com, 3 -> good)