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WordCountDriver.java
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WordCountDriver.java
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package mapreduce.wordcount;
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.io.compress.BZip2Codec;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import java.io.IOException;
public class WordCountDriver {
public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
Configuration conf = new Configuration();
conf.set("fs.defaultFS", "hdfs://localhost:9091");
// 开启map端输出压缩
conf.setBoolean("mapreduce.map.output.compress", true);
// 设置map端输出压缩方式
conf.setClass("mapreduce.map.output.compress.codec", BZip2Codec.class, CompressionCodec.class);
// 1 获取Job对象
Job job = Job.getInstance(conf);
// 2 设置jar存储位置
job.setJarByClass(WordCountDriver.class);
// 3 关联Map和Reduce类
job.setMapperClass(WordCountMapper.class);
job.setReducerClass(WordCountReducer.class);
// 4 设置Mapper阶段输出数据的key,value类型
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
// 5 设置最终数据输出的key,value类型
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
// // Combiner
// job.setCombinerClass(WordCountCombiner.class);
job.setCombinerClass(WordCountReducer.class);
// 设置Reducer端输出压缩开启
FileOutputFormat.setCompressOutput(job, true);
// 设置压缩方式
FileOutputFormat.setOutputCompressorClass(job, BZip2Codec.class);
// 6 设置输入路径和输出路径
FileInputFormat.setInputPaths(job, new Path("/hadooptest.txt"));
FileOutputFormat.setOutputPath(job, new Path("/output"));
// 7 提交job
job.waitForCompletion(true);
}
}