打印rdd

###統計wordcount單詞,並打印出來

valsplitfile=sc.textFile("/a.txt")

valwordcounts=splitfile.flatMap(x=>x.split("\t")).map(word=>(word,1)).reduceByKey(_+ _)

wordcounts.collect().foreach {println}

 

wordcounts.take(3).foreach {println}   ## 打印前三行記錄