java实现spark常用算子之frist

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

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

/**
 * frist 算子：
 *
 * 取RDD的第一个元素
 *
 */
public class FristOperator {
    public static void main(String[] args){
        SparkConf conf  = new SparkConf().setMaster("local").setAppName("FristOperator");
        JavaSparkContext sc = new JavaSparkContext(conf);
        List<String> names = Arrays.asList("w1","w2","w3","w4","w5","W6","W7");
        JavaRDD<String> nameRDD = sc.parallelize(names,2);
        System.err.println(nameRDD.first());
    }
}

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