我使用的Java / Eclipse的/ Hadoop的2.2.0(包括所有必要的罐子)来运行一个样本地图使用下面的代码,但(以下堆栈跟踪)遇到例外情况在Ubuntu Reduce任务(本地单节点)。
我可以运行该取样字从Ubuntu控制台中的Hadoop计算的例子。
import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.conf.Configuration;
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.input.KeyValueTextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
public class testhdfs
{
public static class WordMapper extends Mapper<Text, Text, Text, Text>
{
private Text word = new Text();
public void map(Text key, Text value, Context context) throws IOException, InterruptedException
{
StringTokenizer itr = new StringTokenizer(value.toString(),",");
while (itr.hasMoreTokens())
{
word.set(itr.nextToken());
context.write(key, word);
}
}
}
public static class AllTranslationsReducer
extends Reducer<Text,Text,Text,Text>
{
private Text result = new Text();
public void reduce(Text key, Iterable<Text> values,
Context context
) throws IOException, InterruptedException
{
String translations = "";
for (Text val : values)
{
translations += "|"+val.toString();
}
result.set(translations);
context.write(key, result);
}
}
public static void main(String[] args) throws Exception
{
Configuration conf = new Configuration();
Job job = new Job(conf, "dictionary");
job.setJarByClass(testhdfs.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("/testext"));
FileOutputFormat.setOutputPath(job, new Path("resulthdfs"));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
Exception in thread "main" java.lang.NoSuchMethodError: org.apache.hadoop.conf.Configuration.addDeprecation(Ljava/lang/String;[Ljava/lang/String;)V
at org.apache.hadoop.mapreduce.util.ConfigUtil.addDeprecatedKeys(ConfigUtil.java:53)
at org.apache.hadoop.mapreduce.util.ConfigUtil.loadResources(ConfigUtil.java:41)
at org.apache.hadoop.mapreduce.Job.<clinit>(Job.java:108)
at testhdfs.main(testhdfs.java:49)
NoSuchMethodError
例外几乎总是意味着你有一些奇怪的问题dependency
并拉动的一些错误jar
或缺少jar
。