今天编程又遇到问题了，完整报错如下：
Exception in thread "main" java.lang.NoSuchMethodException: org.apache.zookeeper.server.quorum.QuorumPeer.main([Ljava.lang.String;)at java.lang.Class.getMethod(Class.java:1786)at org.apache.hadoop.util.RunJar.run(RunJar.java:215)at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
解决方法：我们可以将之前的jar包删除，然后重新创建一个jar包，并在创建jar包时设置一个主类
再跑一次应该就能成功了，如果还不行的话，可以将驱动类（如下）job的输入路径与输出路径互换一下
package S1;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.fs.Path;import org.apache.hadoop.io.DoubleWritable;import org.apache.hadoop.io.Text;import org.apache.hadoop.mapreduce.Job;import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;import java.io.IOException;public class main1 {public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException {Job job= Job.getInstance(new Configuration());job.setJarByClass(main1.class);job.setMapperClass(map1.class);job.setMapOutputKeyClass(Text.class);job.setMapOutputValueClass(DoubleWritable.class);//指定job的reducer和输出类型job.setReducerClass(reducer1.class);job.setOutputKeyClass(Text.class);job.setOutputValueClass(Text.class);//指定job的输入和输出路径FileInputFormat.setInputPaths(job,new Path(args[1]));FileOutputFormat.setOutputPath(job,new Path(args[0]));//执行任务job.waitForCompletion(true);}}
再跑一次就出来了
