在mapreduce中设置job.setinputformatclass时出错

uqjltbpv  于 2021-06-04  发布在  Hadoop
关注(0)|答案(1)|浏览(369)

我正在运行一个mapreduce程序。我需要给输入文本文件的键值对的格式。所以如果我写

job.setInputFormatClass(KeyValueTextInputFormat.class);

eclipse编译器显示错误,我不能使用inputformat。总之,我需要设置输入的格式为keyvaluetextinputformat我该怎么做??有什么想法吗?????
我的密码是
`

package com.iot.dictionary;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.KeyValueTextInputFormat;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

import com.iot.dictionary.Dictionary.AllTranslationsReducer;
import com.iot.dictionary.Dictionary.WordMapper;
public class Driver2 {
public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
    Configuration conf = new Configuration();

        String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
        if (otherArgs.length != 2) {
          System.err.println("Usage: wordcount <in> <out>");
          System.exit(2);
        }
        Job job = new Job(conf, "dictionary");
        System.out.println("Job-> "+job.toString());
        job.setJarByClass(Dictionary.class);
        job.setMapperClass(WordMapper.class);
        job.setReducerClass(AllTranslationsReducer.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);
        job.setInputFormatClass(KeyValueTextInputFormat.class);
        FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
        FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}

`

wyyhbhjk

wyyhbhjk1#

如果您使用的是新的hadoop api(hadoop 0.20.2及更高版本),则必须从包org.apache.hadoop.mapreduce.lib.input.keyvaluetextinputformat导入keyvaluetextinputformat.class,如果您使用的是旧的hadoop api,则必须从org.apache.hadoop.mapred.keyvaluetextinputformat导入
你看到代码里的那一行:

import org.apache.hadoop.mapred.KeyValueTextInputFormat;

把它改成

import org.apache.hadoop.mapreduce.lib.input.KeyValueTextInputFormat;

希望这有帮助。
谢谢

相关问题