Shulou(Shulou.com)05/31 Report--

This article mainly introduces hadoop how to achieve two-color ball statistics, the article is very detailed, has a certain reference value, interested friends must read it!

1 / use hadoop to count the red balls adjacent to the two-color ball:

Test data can be found at: http://pan.baidu.com/s/1hq82YrU

Import java.io.IOException;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.conf.Configured;import org.apache.hadoop.fs.Path;import org.apache.hadoop.io.IntWritable;import org.apache.hadoop.io.LongWritable;import org.apache.hadoop.io.NullWritable;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.mapreduce.lib.output.TextOutputFormat;import org.apache.hadoop.util.Tool;import org.apache.hadoop.util.ToolRunner / * mainly filter out two-color ball adjacent numbers * * / public class Adjacent extends Configured implements Tool {/ * counters * used to count all kinds of abnormal data * / enum Counter {LINESKIP / / Line in error} / * MAP Task * / public static class AdjacentMap extends Mapper {public void map (LongWritable key, Text value, Context context) throws IOException, InterruptedException {String line = value.toString () / / read source data: 2003001 10 11 12 13 26 28 11 line = line.replaceAll ("\ t", "") / / filter out tabs try {/ / data processing String [] lineSplit = line.split ("") If (lineSplit.length! = 8) {return } / / the last red ball is not judged here, because the last one will never have an adjacent ball String out = ""; int next =-1 List list = new ArrayList (); for (int item1)

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