欢迎使用CSDN-markdown编辑器

Map过程
IntWritable one = new IntWritable(1);
public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException{
String []res=value.toString().split(“\t”);
String url=res[28];
context.write(new Text(url), one);
}
Reduce过程

public void reduce(Text key, Iterable values,
Context context) throws IOException, InterruptedException{
int sum = 0;
for(IntWritable value:values){
sum+=value.get();
}
context.write(new Text(key.toString()+”:”+sum),NullWritable.get());
}
job过程
public static void main(String[] args) throws Exception{
Configuration conf =new Configuration();
Job job= Job.getInstance(conf,”Pv”);
job.setJarByClass(PvUvjob.class);
Path in=new Path(“/user/input/pv”);
Path out=new Path(“/user/output/pv”);

FileInputFormat.addInputPath(job, in);
FileOutputFormat.setOutputPath(job, out);
job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);

        job.setMapperClass(PvUvMap.class);        job.setReducerClass(PvUvReduce.class);        //map输出类型        job.setMapOutputKeyClass(Text.class);        job.setMapOutputValueClass(IntWritable.class);        //reduce 输出类型        job.setOutputKeyClass(Text.class);        job.setOutputValueClass(NullWritable.class);        job.setNumReduceTasks(1);        job.waitForCompletion(true);    }