Java 运行时未在hadoop-2.0.0-cdh4.3.0 ClassDef中找到mapreduce.lib.chain类

我正在尝试使用lib的ChainMapper/ChainReducer

对于我使用的编译

javac -Xlint -cp /opt/cloudera/parcels/CDH-4.3.0-1.cdh4.3.0.p0.22/lib/hadoop-
mapreduce/*:`hadoop classpath` -d classes *.java

我必须单独包括/opt/cloudera/parcels/CDH-4.3.0-1.cdh4.3.0.p0.22/lib/hadoop-mapreduce/*因为编译器会提出其他问题。它不包含在hadoop类路径中

当我运行jar时，它编译得很好，它说

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/mapreduce/lib/chain/ChainMapper
    at job_name.main(job_name.java:72)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at 

    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
    Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.mapreduce.lib.chain.ChainMapper
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
        ... 6 more

我的驾驶课程如下：

Configuration conf = new Configuration(false);
FileSystem fs = FileSystem.get(conf);
Job job = new Job(conf,"job_name");
job.setJarByClass(SetUpJob.class);
FileInputFormat.setInputPaths(job, new Path(args[1]));
FileOutputFormat.setOutputPath(job, new Path(args[2]));

ChainMapper.addMapper(job,Mapper1.class,LongWritable.class,Text.class,Text.class,IntWritable.class,conf);
ChainReducer.setReducer(job,myReducer.class,LongWritable.class,Text.class,BytesWritable.class,IntWritable.class,conf);
ChainReducer.addMapper(job,Mapper2.class,LongWritable.class,Text.class,Text.class,IntWritable.class,conf);
ChainReducer.setReducer(job,myReducer.class,LongWritable.class,Text.class,BytesWritable.class,IntWritable.class,conf);
ChainReducer.addMapper(job,Mapper3.class,LongWritable.class,Text.class,Text.class,IntWritable.class,conf);
ChainReducer.setReducer(job,myReducer.class,LongWritable.class,Text.class,BytesWritable.class,IntWritable.class,conf);
job.setOutputFormatClass(TextOutputFormat.class);   
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
job.setOutputKeyClass(BytesWritable.class);
job.setOutputValueClass(Text.class);
System.exit(job.waitForCompletion(true) ? 0 : 1);

我以hadoop jar jar_name.jar job_name运行jar

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我的运行时环境是否无法找到该类？如何正确设置？

如何运行此jar文件？你能在这里添加这个命令吗？@Ankur更新了我的问题你能粘贴hadoop类路径的输出吗？因为您说过/opt/cloudera/parcels/CDH-4.3.0-1.cdh4.3.0.p0.22/lib/hadoop-mapreduce/*不在hadoop类路径中，所以在运行hadoop jar之前，您可能需要运行export-hadoop\u类路径=/opt/cloudera/parcels/CDH-4.3.0-1.cdh4.3.0.p0.22/lib/hadoop-mapreduce/*。