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.local.pipeline;
  
  import java.io.IOException;
  import java.util.Iterator;
  
  import org.junit.Before;
  import org.junit.Test;
  
  import com.aliyun.odps.Column;
  import com.aliyun.odps.OdpsType;
  import com.aliyun.odps.counter.Counter;
  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.conf.JobConf;
  import com.aliyun.odps.mapred.local.utils.TestUtils;
  import com.aliyun.odps.pipeline.Pipeline;
  import com.aliyun.odps.pipeline.Pipeline.Builder;
  
  /**
   * TaskNum Test Map & Rudece num
   */
  public class TaskNum extends PipelineExampleBase {
  
    @Before
    public void setUp() throws Exception {
      TestUtils.setEnvironment(TestUtils.pipe);
    }
  
    public static class TaskNumMapper extends MapperBase {
  
      Record val;
  
      @Override
      public void setup(TaskContext context) throws IOException {
        val = context.createMapOutputValueRecord();
      }
  
      @Override
      public void map(long recordNum, Record record, TaskContext context) throws IOException {
        context.write(record, val);
  
        Counter cnt = context.getCounter("MapCounters", "map_input_records");
        cnt.increment(1);
      }
  
      @Override
      public void cleanup(TaskContext context) throws IOException {
      }
    }
  
    /**
     * IdentityReducer
     */
    public static class TaskNumReducer extends ReducerBase {
  
      @Override
      public void setup(TaskContext context) throws IOException {
  
      }
  
      @Override
      public void reduce(Record key, Iterator<Record> values, TaskContext context)
          throws IOException {
        while (values.hasNext()) {
          Record val = values.next();
          context.write(key);
  
          Counter cnt = context.getCounter("ReduceCounters", "reduce_input_records");
          cnt.increment(1);
        }
      }
  
      @Override
      public void cleanup(TaskContext context) throws IOException {
        Record rec = context.createOutputRecord();
        rec.setString(0, "reduce_tag");
        context.write(rec);
      }
    }
  
    @Test
    public void test() throws Exception {
      String[] args = new String[2];
      args[0] = "pipe_tasknum_in";
      args[1] = "pipe_tasknum_out";
      if (args.length != 2 && args.length != 3) {
        System.err.println("Usage: multiinout <in_table> <out_table> <redece_num>");
        System.exit(2);
      }
  
      JobConf job = new JobConf();
      Builder builder = Pipeline.builder();
  
      if (args.length == 3) {
        int reduceNum = Integer.parseInt(args[2]);
        job.setNumReduceTasks(reduceNum);
      }
  
      // mapper
      builder.addMapper(TaskNumMapper.class)
          .setOutputKeySchema(new Column[]{new Column("key", OdpsType.STRING)})
          .setOutputValueSchema(new Column[]{new Column("value", OdpsType.STRING)});
  
      // reducer
      builder.addReducer(TaskNumReducer.class);
  
      Pipeline pipeline = builder.createPipeline();
  
      addInputTable(job, args[0]);
      addOutputTable(job, args[1]);
  
      JobClient.runJob(job, pipeline);
  
    }
  
  }
  