1、代码如下:package com.Merge;import java.io.IOException;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.fs.Path;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.apach
2、e.hadoop.mapreduce.lib.input.FileInputFormat;import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;public class Merge public static class Map extends Mapper private static Text text = new Text(); public void map(Object key, Text value, Context context) throws IOException, InterruptedExcepti
3、on text = value; context.write(text, new Text(); public static class Reduce extends Reducer public void reduce(Text key, Iterable values, Context context) context.write(key, new Text( public static void main(String args) throws Exception Configuration conf = new Configuration(); conf.set(fs.defaultF
4、S, hdfs:/localhost:9000); String otherArgs = new String inputoutput ; if (otherArgs.length != 2) System.err.println(Usage: Merge and duplicate removal System.exit(2); Job job = Job.getInstance(conf, Merge and duplicate removal job.setJarByClass(Merge.class); job.setMapperClass(Map.class); job.setRed
5、ucerClass(Reduce.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(Text.class); FileInputFormat.addInputPath(job, new Path(otherArgs0); FileOutputFormat.setOutputPath(job, new Path(otherArgs1); System.exit(job.waitForCompletion(true) ? 0 : 1);2. 编写程序实现对输入文件的排序现在有多个输入文件,每个文件中的每行内容均为一
6、个整数。要求读取所有文件中的整数,进行升序排序后,输出到一个新的文件中,输出的数据格式为每行两个整数,第一个数字为第二个整数的排序位次,第二个整数为原待排列的整数。实验结果截图:package com.MergeSort;import org.apache.hadoop.io.IntWritable;public class MergeSort public static class Map extends Mapper private static IntWritable data = new IntWritable(); String line = value.toString(); da
7、ta.set(Integer.parseInt(line); context.write(data, new IntWritable(1); public static class Reduce extends Reducer private static IntWritable linenum = new IntWritable(1); public void reduce(IntWritable key, Iterable values, Context context) throws IOException, InterruptedException for (IntWritable v
8、al : values) context.write(linenum, key); linenum = new IntWritable(linenum.get() + 1); input2output2 /* 直接设置输入参数 */ mergesort mergesort job.setJarByClass(MergeSort.class); job.setOutputKeyClass(IntWritable.class); job.setOutputValueClass(IntWritable.class);3. 对给定的表格进行信息挖掘下面给出一个child-parent的表格,要求挖掘其中的父子辈关系,给出祖孙辈关系的表格。实验最后结果截图如下:package com.join;import java.util.*;import org.apache.
copyright@ 2008-2022 冰豆网网站版权所有
经营许可证编号:鄂ICP备2022015515号-1