解决MapReduce编程过程中的 java.io.FileNotFoundException 问题

在运行WordCount程序的过程中出现了如下错误:

DEBUG - LocalFetcher 1 going to fetch: attempt_local938878567_0001_m_000000_0
 WARN - job_local938878567_0001
java.lang.Exception: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in localfetcher#1
    at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
    at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
Caused by: org.apache.hadoop.mapreduce.task.reduce.Shuffle<
package org.apache.hadoop.examples; //#region 引入的包 import java.io.IOException; import java.util.Iterator; 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.output.FileOutputFormat; import org.apache.hadoop.util.GenericOptionsParser; //#endregion //#region单词统计 public class WordCount { public WordCount() { } 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 <in> [<in>...] <out>"); System.exit(2); } Job job = Job.getInstance(conf, "word count"); job.setJarByClass(WordCount.class); job.setMapperClass(WordCount.TokenizerMapper.class); job.setReducerClass(WordCount.IntSumReducer.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); for(int i = 0; i < otherArgs.length - 1; ++i) { FileInputFormat.addInputPath(job, new Path(otherArgs[i])); } FileOutputFormat.setOutputPath(job, new Path(otherArgs[otherArgs.length - 1])); System.exit(job.waitForCompletion(true)?0:1); } public static class TokenizerMapper extends Mapper<Object,Text,Text,IntWritable> { private Text YM = new Text(); private IntWritable temp=new IntWritable(); public TokenizerMapper() { } public void map(Object key, Text value, Context context) throws IOException, InterruptedException { String[] v=(value.toString()).split(" "); String ym=v[1].split("-")[0]+v[1].split("-")[1]; int temp= Integer.parseInt(v[4]); System.out.println(ym); System.out.println( temp); this.YM.set(ym); this.temp.set(temp); context.write(this.YM, this.temp); } } public static class IntSumReducer extends Reducer<Text, IntWritable, Text, IntWritable> { private IntWritable result = new IntWritable(); public IntSumReducer() { } public void reduce(Text key, Iterable<DoubleWritable> values, Context context) throws IOException, InterruptedException { int maxtemp = 0; IntWritable temp; while(values.iterator().hasNext()) { temp = values.iterator().next(); int newtemp=temp.get(); if(newtemp> maxtemp) maxtemp=newtemp; } this.result.set(maxtemp); context.write(key, this.result); } } } //#endregion代码有错,修改
最新发布
11-25
评论 3
成就一亿技术人!
拼手气红包6.0元
还能输入1000个字符
 
红包 添加红包
表情包 插入表情
 条评论被折叠 查看
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值