content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
   * agreements. See the NOTICE file distributed with this work for additional information regarding
   * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance with the License. You may obtain a
   * copy of the License at
   * 
   * http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software distributed under the License
   * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   * or implied. See the License for the specific language governing permissions and limitations under
   * the License.
   */
  
  package com.aliyun.odps.mapred.open.example;
  
  import java.io.IOException;
  import java.util.Iterator;
  
  import com.aliyun.odps.counter.Counter;
  import com.aliyun.odps.counter.Counters;
  import com.aliyun.odps.data.Record;
  import com.aliyun.odps.mapred.JobClient;
  import com.aliyun.odps.mapred.MapperBase;
  import com.aliyun.odps.mapred.ReducerBase;
  import com.aliyun.odps.mapred.RunningJob;
  import com.aliyun.odps.mapred.conf.JobConf;
  import com.aliyun.odps.mapred.utils.SchemaUtils;
  import com.aliyun.odps.mapred.utils.InputUtils;
  import com.aliyun.odps.mapred.utils.OutputUtils;
  import com.aliyun.odps.data.TableInfo;
  
  /**
   * 
   * User Defined Counters
   * 
   **/
  public class UserDefinedCounters {
  
    enum MyCounter {
      TOTAL_TASKS, MAP_TASKS, REDUCE_TASKS
    }
  
    public static class TokenizerMapper extends MapperBase {
      private Record word;
      private Record one;
  
      @Override
      public void setup(TaskContext context) throws IOException {
        super.setup(context);
        Counter map_tasks = context.getCounter(MyCounter.MAP_TASKS);
        Counter total_tasks = context.getCounter(MyCounter.TOTAL_TASKS);
        map_tasks.increment(1);
        total_tasks.increment(1);
  
        word = context.createMapOutputKeyRecord();
        one = context.createMapOutputValueRecord();
        one.set(new Object[] {1L});
      }
  
      @Override
      public void map(long recordNum, Record record, TaskContext context) throws IOException {
        for (int i = 0; i < record.getColumnCount(); i++) {
          word.set(new Object[] {record.get(i).toString()});
          context.write(word, one);
        }
      }
    }
  
    public static class SumReducer extends ReducerBase {
      private Record result = null;
  
      @Override
      public void setup(TaskContext context) throws IOException {
        result = context.createOutputRecord();
        Counter reduce_tasks = context.getCounter(MyCounter.REDUCE_TASKS);
        Counter total_tasks = context.getCounter(MyCounter.TOTAL_TASKS);
        reduce_tasks.increment(1);
        total_tasks.increment(1);
      }
  
      @Override
      public void reduce(Record key, Iterator<Record> values, TaskContext context) throws IOException {
        long count = 0;
        while (values.hasNext()) {
          Record val = values.next();
          count += (Long) val.get(0);
        }
        result.set(0, key.get(0));
        result.set(1, count);
        context.write(result);
      }
    }
  
    public static void main(String[] args) throws Exception {
      if (args.length != 2) {
        System.err.println("Usage: TestUserDefinedCounters <in_table> <out_table>");
        System.exit(2);
      }
  
      JobConf job = new JobConf();
      job.setMapperClass(TokenizerMapper.class);
      job.setReducerClass(SumReducer.class);
  
      job.setMapOutputKeySchema(SchemaUtils.fromString("word:string"));
      job.setMapOutputValueSchema(SchemaUtils.fromString("count:bigint"));
  
      InputUtils.addTable(TableInfo.builder().tableName(args[0]).build(), job);
      OutputUtils.addTable(TableInfo.builder().tableName(args[1]).build(), job);
  
      RunningJob rJob = JobClient.runJob(job);
  
      // 在作业成功结束后，可以获取到job里面的自定义counter的值
      Counters counters = rJob.getCounters();
      long m = counters.findCounter(MyCounter.MAP_TASKS).getValue();
      long r = counters.findCounter(MyCounter.REDUCE_TASKS).getValue();
      long total = counters.findCounter(MyCounter.TOTAL_TASKS).getValue();
  
      System.exit(0);
    }
  }
  