java实现spark常用算子之SaveAsTextFile

 

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.Function;

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

/**
 *  saveastextfile 算子：
 *
 * 将RDD的数据进行保存
 * 会生成一个textSaveAsTextFile文件夹,如果文件存在则抛出异常
 *
 */
public class SaveAsTextFileOperator {

    public static void main(String[] args) {
        SparkConf conf = new SparkConf().setMaster("local").setAppName("saveAsTextFile");
        JavaSparkContext sc = new JavaSparkContext(conf);
        List<String> names = Arrays.asList("w1","w2","w3");

        JavaRDD<String> namerdd = sc.parallelize(names);

        JavaRDD<String> result = namerdd.map(new Function<String, String>() {
            @Override
            public String call(String v1) throws Exception {
                return "RDD:"+v1;
            }
        });

        result.saveAsTextFile("./saveAsTextRdd");
    }
}

 

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