在运行MapReduce作业时，我得到以下异常：
15/12/25 16:00:07 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
15/12/25 16:00:07 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
15/12/25 16:00:07 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String).
Exception in thread "main" org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/C:/Users/HARSH/workspace1/hadoop/words.txt
at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:224)
at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:241)
at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:885)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:779)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:432)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:447)
at hadoop.wordcount.main(wordcount.java:70)
有人能帮忙吗？包文件中有问题吗？我给出的参数是"input.txt output"。
这是代码：
package hadoop;
import org.apache.hadoop.io.IntWritable;
import java.io.IOException;
import java.util.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
public class wordcount {
static public class wordmap extends Mapper<IntWritable, Text, Text, IntWritable>
{
public void map(IntWritable key, Text value, Context context) throws IOException, InterruptedException
{
Text keys = new Text();
IntWritable one= new IntWritable(1);
StringTokenizer tokens= new StringTokenizer(value.toString());
while(tokens.hasMoreTokens())
{
keys.set(tokens.nextToken());
context.write(keys, one);
}
}
}
static public class wordred extends Reducer<Text, IntWritable, Text, IntWritable>
{
public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException
{
int sum=0;
for (IntWritable count : values)
{
sum=sum+ count.get();
}
context.write(key, new IntWritable(sum));
}
}
public static void main(String args[]) throws Exception
{
Configuration conf=new Configuration();
Job job= new Job(conf,"wordcount");
job.setJarByClass(wordcount.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
job.setMapperClass(wordmap.class);
job.setReducerClass(wordred.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
job.waitForCompletion(true);
}
}
这不是编译错误
正如异常明确指出的那样，您的应用程序无法找到文件C:\Users/HARSH/workspace1/hadoop/words.txt
检查：
- 文件存在并且路径正确（请尝试使用绝对路径）
- 你有访问权限
- 没有其他程序打开该文件