UserView--第一种方式set去重，基于Spark算子的java代码实现

package com.hzf.spark.study;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.api.java.function.PairFunction;
import org.apache.spark.api.java.function.VoidFunction;
import org.apache.spark.broadcast.Broadcast;

import scala.Tuple2;

public class UVAnalysis {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf().setAppName("UV_ANA").setMaster("local")
                .set("spark.testing.memory", "2147480000");
        @SuppressWarnings("resource")
        JavaSparkContext sc = new JavaSparkContext(conf);
        JavaRDD<String> logRDD = sc.textFile("userLog1");
        String str = "View";
        final Broadcast<String> broadcast = sc.broadcast(str);
        uvAnalyze(logRDD, broadcast);
    }

    private static void uvAnalyze(JavaRDD<String> logRDD, final Broadcast<String> broadcast) {
        JavaRDD<String> filteredLogRDD = logRDD.filter(new Function<String, Boolean>() {

            private static final long serialVersionUID = 1L;

            @Override
            public Boolean call(String v1) throws Exception {
                String actionParam = broadcast.value();
                String action = v1.split("\t")[5];
                return actionParam.equals(action);
            }
        });

        JavaPairRDD<String, String> pairLogRDD = filteredLogRDD
                .mapToPair(new PairFunction<String, String, String>() {

                    private static final long serialVersionUID = 1L;

                    @Override
                    public Tuple2<String, String> call(String val) throws Exception {
                        String pageId = val.split("\t")[3];
                        String userId = val.split("\t")[2];
                        return new Tuple2<String, String>(pageId, userId);
                    }
                });

        pairLogRDD.groupByKey().foreach(new VoidFunction<Tuple2<String, Iterable<String>>>() {
            private static final long serialVersionUID = 1L;

            @Override
            public void call(Tuple2<String, Iterable<String>> tuple) throws Exception {
                String pageId = tuple._1;
                Iterator<String> iterator = tuple._2.iterator();
                Set<String> userSets = new HashSet<>();
                while (iterator.hasNext()) {
                    String userId = iterator.next();
                    userSets.add(userId);
                }
                System.out.println("PAGEID:" + pageId + "\t UV_COUNT:" + userSets.size());
            }
        });
    }
}