spark小例子

 

import org.apache.spark.SparkConf
import org.apache.spark.SparkContext

object MaxTemperaturer {
  def main(args: Array[String]): Unit = {
    var conf = new SparkConf().setAppName("MaxGroup").setMaster("local")
    var sc = new SparkContext(conf)
    sc.textFile("/Users/lihu/Desktop/crawle/maxforgroup.txt").map(_.split("\t")).filter(_(1) != "0").map(rec => (rec(0).toInt, rec(1).toInt)).reduceByKey(Math.max(_,_)).saveAsTextFile("/Users/lihu/Desktop/crawle/MaxTemperatureLogsss")
  }
}

 

// 出现次数最多的8个单词
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext

object TopSearchKeyWords {
  def main(args: Array[String]): Unit = {
    var conf = new SparkConf().setAppName("TopSearchKeyWords").setMaster("local")
    var sc = new SparkContext(conf)
    var src = sc.textFile("/Users/lihu/Desktop/crawle/wahah.txt")
    var countData = src.map(line => (line.toLowerCase(),1)).reduceByKey(_+_)
    var sortedData = countData.map{case (k,v) => (v,k)}.sortByKey(false)
    var topData = sortedData.take(8).map{case (v, k) => (k, v)}.foreach(println _)
    
  }
}

 

// 统计单词个数，不区分大小写
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext

object TopSearchKeyWords {
  def main(args: Array[String]): Unit = {
    var conf = new SparkConf().setAppName("TopSearchKeyWords").setMaster("local")
    var sc = new SparkContext(conf)
    var src = sc.textFile("/Users/lihu/Desktop/crawle/wahah.txt")
    var countData = src.map(line => (line.toLowerCase(),1)).countByKey().foreach(println _)

      var countData1 = src.map(line => (line.toLowerCase(),1)).reduceByKey(_+_).collect().foreach(println _)

  }
}

 

// 统计男生女生的人数，最高个子和最低个子等
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext

object TopPeopleSecond {  
  def main(args: Array[String]): Unit = {  
  val conf=new SparkConf().setAppName("TopNSecond by Scala").setMaster("local");  
  val sc=new SparkContext(conf);  
  val data=sc.textFile("/Users/lihu/Desktop/crawle/xingbie.txt",1);  
  val lines=data.map{ line => (line.split(" ")(1),line.split(" ")(2).toInt) };  
  val groups=lines.groupByKey();  
  lines.countByKey().foreach(println _)
  groups.map(tu=> (tu._1,tu._2.max)).foreach(println _);  
  groups.map(tu=> (tu._1,tu._2.min)).foreach(println _);
  groups.map(w => (w._1, w._2.sum)).collect().foreach(println)
  sc.stop();  
  }  
}