Created
February 11, 2022 10:58
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| import java.io.IOException; | |
| import java.util.Iterator; | |
| import org.apache.hadoop.conf.Configuration; | |
| import org.apache.hadoop.fs.Path; | |
| import org.apache.hadoop.io.IntWritable; | |
| import org.apache.hadoop.io.Text; | |
| import org.apache.hadoop.mapred.JobClient; | |
| import org.apache.hadoop.mapred.JobConf; | |
| import org.apache.hadoop.mapred.OutputCollector; | |
| import org.apache.hadoop.mapred.Reporter; | |
| import org.apache.hadoop.mapred.TextInputFormat; | |
| import org.apache.hadoop.mapred.TextOutputFormat; | |
| 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 CSVCounter { | |
| public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable>{ | |
| private final static IntWritable one = new IntWritable(1); | |
| private Text word = new Text(); | |
| public void map(Object key, Text value, Context context) throws IOException, InterruptedException { | |
| String line = value.toString(); | |
| String[] lineSplit = line.split(","); | |
| String ip = lineSplit[0]; | |
| word = new Text(ip); | |
| context.write(word, one); | |
| } | |
| } | |
| public static class IntSumReducer extends Reducer<Text,IntWritable,Text,IntWritable> { | |
| public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException { | |
| int sum = 0; | |
| for (IntWritable val : values) { | |
| sum += val.get(); | |
| } | |
| context.write(key, new IntWritable(sum)); | |
| } | |
| } | |
| public static void main(String[] args) throws Exception { | |
| Configuration conf = new Configuration(); | |
| Job job = Job.getInstance(conf, "word count"); | |
| job.setJarByClass(CSVCounter.class); | |
| job.setMapperClass(TokenizerMapper.class); | |
| job.setCombinerClass(IntSumReducer.class); | |
| job.setReducerClass(IntSumReducer.class); | |
| job.setOutputKeyClass(Text.class); | |
| job.setOutputValueClass(IntWritable.class); | |
| FileInputFormat.addInputPath(job, new Path(args[0])); | |
| FileOutputFormat.setOutputPath(job, new Path(args[1])); | |
| System.exit(job.waitForCompletion(true) ? 0 : 1); | |
| } | |
| } |
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