TestStreamingCombiner.java

/**
 * 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 org.apache.hadoop.streaming;

import java.io.IOException;

import org.apache.hadoop.mapred.Counters;

public class TestStreamingCombiner extends TestStreaming {

  protected String combine = StreamUtil.makeJavaCommand(UniqApp.class, new String[]{""});
  
  public TestStreamingCombiner() throws IOException {
    super();
  }
  
  protected String[] genArgs() {
    return new String[] {
      "-input", INPUT_FILE.getAbsolutePath(),
      "-output", OUTPUT_DIR.getAbsolutePath(),
      "-mapper", map,
      "-reducer", reduce,
      "-combiner", combine,
      "-jobconf", "stream.tmpdir="+System.getProperty("test.build.data","/tmp")
    };
  }

  public void testCommandLine() throws IOException {
    super.testCommandLine();
    // validate combiner counters
    String counterGrp = "org.apache.hadoop.mapred.Task$Counter";
    Counters counters = job.running_.getCounters();
    assertTrue(counters.findCounter(
               counterGrp, "COMBINE_INPUT_RECORDS").getValue() != 0);
    assertTrue(counters.findCounter(
               counterGrp, "COMBINE_OUTPUT_RECORDS").getValue() != 0);
  }

  public static void main(String[]args) throws Exception
  {
    new TestStreamingCombiner().testCommandLine();
  }

}