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;
  
  import org.junit.Before;
  import org.junit.Test;
  
  import com.aliyun.odps.data.TableInfo;
  import com.aliyun.odps.mapred.JobClient;
  import com.aliyun.odps.mapred.RunningJob;
  import com.aliyun.odps.mapred.conf.JobConf;
  import com.aliyun.odps.mapred.local.lib.IdentityReducer;
  import com.aliyun.odps.mapred.local.lib.InverseMapper;
  import com.aliyun.odps.mapred.local.lib.LongSumReducer;
  import com.aliyun.odps.mapred.local.lib.RegexMapper;
  import com.aliyun.odps.mapred.local.utils.TestUtils;
  import com.aliyun.odps.mapred.utils.InputUtils;
  import com.aliyun.odps.mapred.utils.OutputUtils;
  import com.aliyun.odps.mapred.utils.SchemaUtils;
  
  /**
   * Extracts matching regexs from input files and counts them.
   */
  public class Grep {
  
    @Before
    public void setUp() throws Exception {
      TestUtils.setEnvironment(TestUtils.odps_test_mrtask);
    }
  
    @Test
    public void test() throws Exception {
      String[] args = new String[4];
      args[0] = TestUtils.getInputTableName(this);
      args[1] = "grep_temp";
      args[2] = TestUtils.getOutputTableName(this);
      args[3] = "\\w+";
  
      if (args.length < 4) {
        System.err.println("Grep <inDir> <tmpDir> <outDir> <regex> [<group>]");
        System.exit(2);
      }
  
      JobConf grepJob = new JobConf();
  
      grepJob.setMapperClass(RegexMapper.class);
      grepJob.setReducerClass(LongSumReducer.class);
  
      grepJob.setMapOutputKeySchema(SchemaUtils.fromString("word:string"));
      grepJob.setMapOutputValueSchema(SchemaUtils.fromString("count:bigint"));
  
      InputUtils
          .addTable(TableInfo.builder().tableName(args[0]).build(), grepJob);
      OutputUtils.addTable(TableInfo.builder().tableName(args[1]).build(),
                           grepJob);
  
      grepJob.set("mapred.mapper.regex", args[3]);
      if (args.length == 5) {
        grepJob.set("mapred.mapper.regex.group", args[4]);
      }
  
      RunningJob rjGrep = JobClient.runJob(grepJob);
      rjGrep.waitForCompletion();
      rjGrep.getJobStatus().getState();
  
      JobConf sortJob = new JobConf();
  
      sortJob.setMapperClass(InverseMapper.class);
      sortJob.setReducerClass(IdentityReducer.class);
  
      sortJob.setMapOutputKeySchema(SchemaUtils.fromString("count:bigint"));
      sortJob.setMapOutputValueSchema(SchemaUtils.fromString("word:string"));
  
      InputUtils
          .addTable(TableInfo.builder().tableName(args[1]).build(), sortJob);
      OutputUtils.addTable(TableInfo.builder().tableName(args[2]).build(),
                           sortJob);
  
      sortJob.setNumReduceTasks(1); // write a single file
      sortJob.setOutputKeySortColumns(new String[]{"count"}); // sort by
      // decreasing
      // freq
  
      RunningJob rjSort = JobClient.runJob(sortJob);
      rjSort.waitForCompletion();
    }
  
  }
  