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  • spark action之countbykey

    java

     1 public class CountByKeyDemo {
     2     private static SparkConf conf = new SparkConf().setMaster("local").setAppName("countbykeydemo");
     3     private static JavaSparkContext jsc = new JavaSparkContext(conf);
     4     public static void main(String[] args) {
     5         List<Tuple2<String,Integer>> list = Arrays.asList(
     6                                             new Tuple2<String,Integer>("tele",100),
     7                                             new Tuple2<String,Integer>("tele",200),
     8                                             new Tuple2<String,Integer>("tele",300),
     9                                             new Tuple2<String,Integer>("yeye",50),
    10                                             new Tuple2<String,Integer>("yeye",10),
    11                                             new Tuple2<String,Integer>("yeye",70),
    12                                             new Tuple2<String,Integer>("wyc",10000)
    13                                              );
    14         
    15         JavaPairRDD<String, Integer> rdd = jsc.parallelizePairs(list);
    16         
    17         Map<String, Long> map = rdd.countByKey();
    18         map.entrySet().forEach(i-> System.out.println(i.getKey() + ":" + i.getValue()));
    19         
    20         jsc.close();
    21     }
    22 }

    scala

     1 object CountByKeyDemo {
     2     def main(args: Array[String]): Unit = {
     3     val conf = new SparkConf().setMaster("local").setAppName("countdemo");
     4     val sc = new SparkContext(conf);
     5     
     6     val arr = Array(("class1","tele"),("class1","yeye"),("class2","wyc"));
     7     val rdd = sc.parallelize(arr,1);
     8     
     9     val result = rdd.countByKey();
    10     for((k,v) <- result) {
    11       println(k + ":" + v);
    12     }
    13   }
    14 }

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  • 原文地址:https://www.cnblogs.com/tele-share/p/10269098.html
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