hadoop多路输出器,不要忘记close()

package com.ws.userprofile;

import com.google.gson.Gson;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
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.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.MultipleOutputs;

import java.io.IOException;
import java.util.Set;

public class userProfileMr {
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();

        Job job = Job.getInstance(conf);

        job.setJarByClass(userProfileMr.class);

        job.setMapperClass(M.class);
        job.setNumReduceTasks(0);

        job.setOutputKeyClass(NullWritable.class);
        job.setOutputValueClass(Text.class);

        FileInputFormat.setInputPaths(job, new Path("hdfs://dream1:9000/userprofile/input"));
        FileOutputFormat.setOutputPath(job, new Path("hdfs://dream1:9000/userprofile/output"));

        job.waitForCompletion(true);
    }

    public static class M extends Mapper<LongWritable, Text, NullWritable, Text> {
        MultipleOutputs<NullWritable, Text> multipleOutputs;
        Gson g = new Gson();
        Text v = new Text();
        NullWritable k = NullWritable.get();

        @Override
        protected void setup(Context context) {
            //用多路输出器，输出gid,tags 格式数据到 目录
            multipleOutputs = new MultipleOutputs<>(context);
        }

        @Override
        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
            UserTags userTags = g.fromJson(value.toString(), UserTags.class);
            String gid = userTags.getGid();
            v.set(gid + "@" + value.toString());
            multipleOutputs.write(k, v, "hdfs://dream1:9000/userprofile/tags/");
            Set<String> imei = userTags.getIds().keySet();
            for (String id : imei) {
                v.set(id + "@" + gid);
                multipleOutputs.write(k, v, "hdfs://dream1:9000/userprofile/index/");
            }
        }

        @Override
        protected void cleanup(Context context) throws IOException, InterruptedException {
            multipleOutputs.close();
        }
    }
}