| /** |
| * 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.mapreduce.lib.chain; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.HadoopTestCase; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.MapReduceTestUtil; |
| import org.apache.hadoop.mapreduce.lib.map.TokenCounterMapper; |
| import org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer; |
| |
| import java.io.IOException; |
| |
| /** |
| * Runs wordcount by adding single mapper and single reducer to chain |
| */ |
| public class TestSingleElementChain extends HadoopTestCase { |
| |
| private static String localPathRoot = System.getProperty("test.build.data", |
| "/tmp"); |
| |
| public TestSingleElementChain() throws IOException { |
| super(HadoopTestCase.LOCAL_MR, HadoopTestCase.LOCAL_FS, 1, 1); |
| } |
| |
| // test chain mapper and reducer by adding single mapper and reducer to chain |
| public void testNoChain() throws Exception { |
| Path inDir = new Path(localPathRoot, "testing/chain/input"); |
| Path outDir = new Path(localPathRoot, "testing/chain/output"); |
| String input = "a\nb\na\n"; |
| String expectedOutput = "a\t2\nb\t1\n"; |
| |
| Configuration conf = createJobConf(); |
| |
| Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 1, 1, input); |
| job.setJobName("chain"); |
| |
| ChainMapper.addMapper(job, TokenCounterMapper.class, Object.class, |
| Text.class, Text.class, IntWritable.class, null); |
| |
| ChainReducer.setReducer(job, IntSumReducer.class, Text.class, |
| IntWritable.class, Text.class, IntWritable.class, null); |
| |
| job.waitForCompletion(true); |
| assertTrue("Job failed", job.isSuccessful()); |
| assertEquals("Outputs doesn't match", expectedOutput, MapReduceTestUtil |
| .readOutput(outDir, conf)); |
| } |
| |
| } |