sparkrdd自动转换能用pairfun(否则无法用reducebykey,groupbykey)
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引入import org.apache.spark.SparkContext._
注意与import org.apache.spark.SparkContext不同，这个是为了用sparkcontex
国外的网站上
SparkContext provides an implicit conversion from RDD[T] to > PairRDDFunctions[T] to make this transparent to users.>> To import those implicit conversions, use>> import org.apache.spark.SparkContext._>>> These conversions are automatically imported by Spark Shell, but > you'll have to import them yourself in standalone programs.>>
总结 ：写spark程序你永远不知道下一步会卡在哪里！
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