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package mobvista.prd.datasource.eggplants;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.compress.GzipCodec;
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.util.GenericOptionsParser;
import java.io.IOException;
/**
* Created by Administrator on 2017/5/3 0003.
*/
public class EggplantsCountMR {
public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
Configuration conf = new Configuration();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
conf.set("mapreduce.reduce.memory.mb", "1280");
Job job = Job.getInstance(conf, "EggplantsAppCountryAllMR");
job.setJarByClass(EggplantsAppCountryAllMR.class);
FileOutputFormat.setCompressOutput(job, true);
FileOutputFormat.setOutputCompressorClass(job, GzipCodec.class);
job.setMapperClass(EggplantsMapper.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
// job.setCombinerClass(EggplantsCombiner.class);
job.setReducerClass(EggplantsReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(Text.class);
FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
public static class EggplantsMapper extends Mapper<LongWritable, Text, Text, Text> {
Text outKey = new Text();
Text outValue = new Text();
public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
String line = value.toString();
String[] fields = line.split("\t", -1);
outKey.set(fields[0] + "\t" + fields[1]);
outValue.set(fields[2]);
context.write(outKey, outValue);
}
}
public static class EggplantsReducer extends Reducer<Text, Text, Text, Text> {
Text outKey = new Text();
Text outValue = new Text();
public void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException {
int all = 0;
for (Text val:values) {
all++;
}
outValue.set(all+"");
context.write(key, outValue);
}
}
}