在Java中执行PigServer时出错 [英] Error executing PigServer in Java

问题描述

我正在尝试从Java机器上远程运行Pig脚本，因为我已经在下面的代码中编写了

I am trying to run pig scripts remotely from my java machine, for that i have written below code

代码:

import java.io.IOException;
import java.util.Properties;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;

public class Javapig{ 
public static void main(String[] args) {
try {
    Properties props = new Properties();
    props.setProperty("fs.default.name", "hdfs://hdfs://192.168.x.xxx:8022");
    props.setProperty("mapred.job.tracker", "192.168.x.xxx:8021");

    PigServer pigServer = new PigServer(ExecType.MAPREDUCE, props);
    runIdQuery(pigServer, "fact");
    }
    catch(Exception e) {
        System.out.println(e);
    }
 }
public static void runIdQuery(PigServer pigServer, String inputFile) throws IOException {
    pigServer.registerQuery("A = load '" + inputFile + "' using org.apache.hive.hcatalog.pig.HCatLoader();");
    pigServer.registerQuery("B = FILTER A by category == 'Aller';");
    pigServer.registerQuery("DUMP B;");
    System.out.println("Done");
 }
}

但是在执行时，我遇到了以下错误.

but while executing i am getting below error.

错误

ERROR 4010: Cannot find hadoop configurations in classpath (neither hadoop-site.xml nor core-site.xml was found in the classpath).

我不知道我在做什么错.

I don't know what am i doing wrong.

推荐答案

嗯，自我描述错误...

Well, self describing error...

在类路径中找不到hadoop-site.xml和core-site.xml

neither hadoop-site.xml nor core-site.xml was found in the classpath

您需要在应用程序的类路径中同时使用这两个文件.

You need both of those files in the classpath of your application.

理想情况下，假设您具有Maven结构，则可以从$HADOOP_CONF_DIR文件夹中获取这些文件，并将其复制到Java的src/main/resources中.

You ideally would get those from your $HADOOP_CONF_DIR folder, and you would copy them into your Java's src/main/resources, assuming you have a Maven structure

此外，对于那些文件，您应该将Configuration对象用于Hadoop

Also, with those files, you should rather use a Configuration object for Hadoop

PigServer(ExecType execType, org.apache.hadoop.conf.Configuration conf)

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