运行的时候console出现报错:
java.io.FileNotFoundException: god.txt (No such file or directory)
这是我的代码:
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.net.URI;
import java.util.StringTokenizer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
public class WordCountWithDistributedCache {
public static void UseDistributedCacheBySymbolicLink() throws Exception {
FileReader reader = new FileReader("god.txt");
BufferedReader br = new BufferedReader(reader);
String s1 = null;
while ((s1 = br.readLine()) != null) {
System.out.println(s1);
}
br.close();
reader.close();
}
public static class TokenizerMapper extends
Mapper {
private final static IntWritable one = new IntWritable(1);
private Text word = new Text();
protected void setup(Context context) throws IOException,
InterruptedException {
// DistributedCache.getLocalCacheFiles(context.getConfiguration());
System.out.println("Now, use the distributed cache and syslink");
try {
UseDistributedCacheBySymbolicLink();
} catch (Exception e) {
e.printStackTrace();
}
}
public void map(Object key, Text value, Context context)
throws IOException, InterruptedException {
StringTokenizer itr = new StringTokenizer(value.toString());
while (itr.hasMoreTokens()) {
word.set(itr.nextToken());
context.write(word, one);
}
}
}
public static class IntSumReducer extends
Reducer {
private IntWritable result = new IntWritable();
public void reduce(Text key, Iterable[I] values,
Context context) throws IOException, InterruptedException {
int sum = 0;
for (IntWritable val : values) {
sum += val.get();
}
result.set(sum);
context.write(key, result);
}
}
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration();
String[] otherArgs = new GenericOptionsParser(conf, args)
.getRemainingArgs();
if (otherArgs.length != 2) {
System.err.println("Usage: wordcount [i] ");
System.exit(2);
}
String path = "hdfs://localhost:9000/123";
Path filePath = new Path(path);
String uriWithLink = filePath.toUri().toString() + "#god.txt";
DistributedCache.addCacheFile(new URI(uriWithLink), conf);
// DistributedCache.createSymlink(conf);
Job job = new Job(conf, "WordCountWithDistributedCache");
job.setJarByClass(WordCountWithDistributedCache.class);
job.setMapperClass(TokenizerMapper.class);
job.setCombinerClass(IntSumReducer.class);
job.setReducerClass(IntSumReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
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