package avg; import common.TemperatureMapper; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; 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; /** * @program: ch2noaa * @description: * @author: 赖键锋 * @create: 2018-11-26 12:45 **/ public class AvgTemperature { public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException { if (args.length != 2) { System.err.println("Usage: AvgTemperature <input path> <output path>"); System.exit(-1); } Job job = Job.getInstance(); job.setJarByClass(AvgTemperature.class); job.setJobName("MapReduce实验-气象数据集-求气温平均值"); FileInputFormat.addInputPath(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); job.setMapperClass(TemperatureMapper.class); job.setReducerClass(AvgTemperatureReducer.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); System.exit(job.waitForCompletion(true) ? 0 : 1); } }