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.example;
  
  import java.io.IOException;
  import java.util.Iterator;
  
  import com.aliyun.odps.Column;
  import com.aliyun.odps.OdpsException;
  import com.aliyun.odps.OdpsType;
  import com.aliyun.odps.data.Record;
  import com.aliyun.odps.data.TableInfo;
  import com.aliyun.odps.mapred.JobClient;
  import com.aliyun.odps.mapred.MapperBase;
  import com.aliyun.odps.mapred.ReducerBase;
  import com.aliyun.odps.mapred.conf.JobConf;
  import com.aliyun.odps.mapred.utils.InputUtils;
  import com.aliyun.odps.mapred.utils.OutputUtils;
  
  public class Identity {
  
    public static class IdentityMapper extends MapperBase {
  
      Record v;
  
      @Override
      public void setup(TaskContext context) throws IOException {
        v = context.createMapOutputValueRecord();
      }
  
      @Override
      public void map(long recordNum, Record record, TaskContext context)
          throws IOException {
        context.write(record, v);
      }
    }
  
    public static class IdentityReducer extends ReducerBase {
  
      @Override
      public void reduce(Record key, Iterator<Record> values, TaskContext context)
          throws IOException {
        context.write(key);
      }
    }
  
    public static void main(String[] args) throws OdpsException {
      if (args.length != 2) {
        System.err.println("Usage: Identity <in_table> <out_table>");
        System.exit(2);
      }
  
      JobConf job = new JobConf();
      job.setMapperClass(IdentityMapper.class);
      job.setReducerClass(IdentityReducer.class);
      job.setMapOutputKeySchema(new Column[]{new Column("word", OdpsType.STRING)});
      job.setMapOutputValueSchema(new Column[]{new Column("count",
                                                          OdpsType.BIGINT)});
  
      InputUtils.addTable(TableInfo.builder().tableName(args[0]).build(), job);
      OutputUtils.addTable(TableInfo.builder().tableName(args[1]).build(), job);
  
      JobClient.runJob(job);
    }
  }
  