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);
}
}
`
1条答案
按热度按时间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:
把它改成
希望这有帮助。
谢谢