5

我正在运行一个 MapReduce 程序。我需要以 KEYVALUE 对的格式提供输入文本文件。所以如果我写

job.setInputFormatClass(KeyValueTextInputFormat.class);

eclipse 编译器显示我无法使用 InputFormat 的错误。无论如何我需要将输入的格式设置为 KeyValueTextInputFormat 我该怎么做?任何想法 ?????

我的代码是

`

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);
    }
}

`

4

1 回答 1

10

如果您使用新的 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 类,如果您使用的是旧 Hadoop API,你必须从 org.apache.hadoop.mapred.KeyValueTextInputFormat 导入它

您在代码中看到该行:

import org.apache.hadoop.mapred.KeyValueTextInputFormat;

将其更改为

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

希望这可以帮助。

谢谢

于 2013-06-06T11:54:51.347 回答