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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.LongWritable;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;public class Test2 { enum Counter { LINESKIP,//记录出错的行 } public static class Map extends Mapper<LongWritable, Text, Text, Text>{ public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { String line = value.toString();//读取源数据 try { //数据处理 String [] lineSplit = line.split(" ");//18661629496,110 String anum = lineSplit[0]; String bnum = lineSplit[1]; //输出格式：110,18661629496
context.write(new Text(bnum), new Text(anum)); } catch(ArrayIndexOutOfBoundsException e) { context.getCounter(Counter.LINESKIP).increment(1);//出错时计数器+1 return; } } } public static class Reduce extends Reducer<Text, Text, Text, Text> { public void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException { String valueString; String out=""; for(Text value:values) { valueString=value.toString(); out+=valueString+"|"; } context.write(key, new Text(out)); } } public static void main(String[] args) throws Exception { Configuration conf = new Configuration(); if (args.length != 2) { System.err.println("请配置输入输出路径 "); System.exit(2); } //各种配置 Job job = new Job(conf, "telephone ");//作业名称配置 //类配置 job.setJarByClass(Test2.class); job.setMapperClass(Map.class); job.setReducerClass(Reduce.class); //map输出格式配置 job.setMapOutputKeyClass(Text.class); job.setMapOutputValueClass(Text.class); //作业输出格式配置 job.setOutputKeyClass(Text.class); job.setOutputValueClass(Text.class); //添加输入输出路径 FileInputFormat.addInputPath(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); //任务完毕时退出 System.exit(job.waitForCompletion(true) ? 0 : 1); }} |
