java實現spark常用算子之distinct

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.VoidFunction;

import java.util.Arrays;
import java.util.List;

/**
 * distinct 算子：
 * 簡單去重
 *
 */
public class DistinctOperator {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf().setMaster("local").setAppName("distinct");
        JavaSparkContext sc  = new JavaSparkContext(conf);
        List<String> list1 = Arrays.asList("w1","w2","w3","w4","w2");

        JavaRDD<String> list1Rdd = sc.parallelize(list1);

        //此時result有3個分區
        JavaRDD<String> result = list1Rdd.distinct(2);

        result.foreach(new VoidFunction<String>() {
            @Override
            public void call(String s) throws Exception {
                System.err.println(s);
            }
        });

    }
}

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