无法将 Spark 与 Eclipse 中的 Hortonworks Sandbox 连接

Question

我无法连接我在 eclipse 上编写的 spark 代码。

下面是代码，请指导我如何做同样的事情。 任何事情都会有帮助

> 
>     import java.util.Arrays;
> 
>     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;
> 
>      public class SparkTest {
> 
        public static void main(String[] args) {

>          SparkConf conf = new SparkConf()
              .setAppName("JD Word Counter").setMaster("local");

> 
>          JavaSparkContext sc = new JavaSparkContext(conf);
>               //hdfs://localhost:8020/user/root/textfile/test.txt         
           JavaRDD<String> inputFile = sc.textFile("hdfs://localhost:8020/user/root/textfile/test.txt");

>          System.out.println("Hello start");
>          System.out.println(inputFile.collect());         
           JavaRDD<String> wordsFromFile = inputFile.flatMap(content ->
            Arrays.asList(content.split(" ")).iterator());

>          System.out.println("hello end");
>       
> 
>          //JavaPairRDD countData = wordsFromFile.mapToPair(t -> new Tuple2(t, 1)).reduceByKey((x, y) -> (int) x + (int) y);
          //wordsFromFile
           .saveAsTextFile("hdfs://localhost:8020/user/root/fileTest/");

> 
>          System.out.println(" This java program is complete");    

       }
> 
>     }
>

错误：

> I/O error constructing remote block reader.
> org.apache.hadoop.net.ConnectTimeoutException: 60000 millis timeout
> while waiting for  channel to be ready for connect. ch :
> java.nio.channels.SocketChannel[connection-pending 
> remote=/172.18.0.2:50010] at org.apache.hadoop.net.NetUtils.c

Answer 1

将 hdp 沙箱的 localhost 更改为 ip address 或将 hdfs-site.xml 文件放入您的类路径并确保所有端口都已打开并可从外部机器访问。