我终于看懂了这一段好爽

小丽0228

于 2019-06-09 10:22:12 发布

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分类专栏：大数据

本文链接：https://blog.youkuaiyun.com/m0_37558366/article/details/91350815

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    val movieAndRating = ratings.map(x=>(x._2,(x._3.toDouble,1))).reduceByKey((x,y)=>(x._1+y._1,x._2+y._2))
    movieAndRating.take(10).foreach(println)//(2329,(2705.0,640))//获取某电影的总评分和点评人数
    println("++++++++++++++++++++++++++++++++++++++++++++++++=")
    //7.得到格式为(MovieID,(sum(ratings),count(ratings))),把每个电影的sum(ratings)和count(ratings)相除，得到包含电影ID和平均评分的RDD
    val avgRating = movieAndRating.map(x=>(x._1,x._2._1.toDouble/x._2._2))