[英]getting error while executing wordcount program in hadoop
I'm trying to execute the WordCount program for hadoop in eclipse and i'm getting following error: 我正在尝试在Eclipse中为hadoop执行WordCount程序,并且出现以下错误:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at WordCount.run(WordCount.java:22)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at WordCount.main(WordCount.java:35)
I have copied the code from internet and the code seems fine however for reference i'm pasting the code here: 我已经从互联网复制了代码,该代码看起来不错,但是为了参考,我将代码粘贴在这里:
WordCount.java WordCount.java
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.util.*;
public class WordCount extends Configured implements Tool{
public int run(String[] args) throws Exception
{
//creating a JobConf object and assigning a job name for identification purposes
JobConf conf = new JobConf(getConf(), WordCount.class);
conf.setJobName("WordCount");
//Setting configuration object with the Data Type of output Key and Value
conf.setOutputKeyClass(Text.class);
conf.setOutputValueClass(IntWritable.class);
//Providing the mapper and reducer class names
conf.setMapperClass(WordCountMapper.class);
conf.setReducerClass(WordCountReducer.class);
//We wil give 2 arguments at the run time, one in input path and other is output path
Path inp = new Path(args[0]);
Path out = new Path(args[1]);
//the hdfs input and output directory to be fetched from the command line
FileInputFormat.addInputPath(conf, inp);
FileOutputFormat.setOutputPath(conf, out);
JobClient.runJob(conf);
return 0;
}
public static void main(String[] args) throws Exception
{
// this main function will call run method defined above.
int res = ToolRunner.run(new Configuration(), new WordCount(),args);
System.exit(res);
}
} }
似乎您没有传递正确的命令行参数。
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