20170924总结
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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<IntWritable> 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); }
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