單項選擇題

在Spark應(yīng)用開發(fā)中,以下哪項的代碼能正確進行單詞統(tǒng)計?()

A.valcounts=textFile.map(line=>line.split(“”)).map(-rd=>(word,1)).reduceByKey(_+_)
B.valcounts=textFile.flatMap(line=>line.split(“”)).map(word=>(word,1)).reduceByKey(_+_)
C.valcounts=textFile.map(line=>line.split(“”)).map(word=>(word,1)).groupByKey(_+_)
D.valcounts=textFile.flatMap(line=>line.split(“”)).map(word=>(word,1)).groupByKey(_+_)

微信掃碼免費搜題