| /** |
| * 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 java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.LongWritable; |
| 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.Mapper; |
| import org.apache.hadoop.mapreduce.Reducer; |
| |
| /** |
| * Tests error conditions in ChainMapper/ChainReducer. |
| */ |
| public class TestChainErrors extends HadoopTestCase { |
| |
| private static String localPathRoot = System.getProperty("test.build.data", |
| "/tmp"); |
| |
| public TestChainErrors() throws IOException { |
| super(HadoopTestCase.LOCAL_MR, HadoopTestCase.LOCAL_FS, 1, 1); |
| } |
| |
| private Path inDir = new Path(localPathRoot, "testing/chain/input"); |
| private Path outDir = new Path(localPathRoot, "testing/chain/output"); |
| private String input = "a\nb\nc\nd\n"; |
| |
| /** |
| * Tests errors during submission. |
| * |
| * @throws Exception |
| */ |
| public void testChainSubmission() throws Exception { |
| |
| Configuration conf = createJobConf(); |
| |
| Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 0, 0, input); |
| job.setJobName("chain"); |
| |
| Throwable th = null; |
| // output key,value classes of first map are not same as that of second map |
| try { |
| ChainMapper.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| IntWritable.class, Text.class, null); |
| ChainMapper.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| } catch (IllegalArgumentException iae) { |
| th = iae; |
| } |
| assertTrue(th != null); |
| |
| th = null; |
| // output key,value classes of reducer are not |
| // same as that of mapper in the chain |
| try { |
| ChainReducer.setReducer(job, Reducer.class, LongWritable.class, |
| Text.class, IntWritable.class, Text.class, null); |
| ChainMapper.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| } catch (IllegalArgumentException iae) { |
| th = iae; |
| } |
| assertTrue(th != null); |
| } |
| |
| /** |
| * Tests one of the mappers throwing exception. |
| * |
| * @throws Exception |
| */ |
| public void testChainFail() throws Exception { |
| |
| Configuration conf = createJobConf(); |
| |
| Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 1, 0, input); |
| job.setJobName("chain"); |
| |
| ChainMapper.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| ChainMapper.addMapper(job, FailMap.class, LongWritable.class, Text.class, |
| IntWritable.class, Text.class, null); |
| |
| ChainMapper.addMapper(job, Mapper.class, IntWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| job.waitForCompletion(true); |
| assertTrue("Job Not failed", !job.isSuccessful()); |
| } |
| |
| /** |
| * Tests Reducer throwing exception. |
| * |
| * @throws Exception |
| */ |
| public void testReducerFail() throws Exception { |
| |
| Configuration conf = createJobConf(); |
| |
| Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 1, 1, input); |
| job.setJobName("chain"); |
| |
| ChainMapper.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| ChainReducer.setReducer(job, FailReduce.class, LongWritable.class, |
| Text.class, LongWritable.class, Text.class, null); |
| |
| ChainReducer.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| job.waitForCompletion(true); |
| assertTrue("Job Not failed", !job.isSuccessful()); |
| } |
| |
| /** |
| * Tests one of the maps consuming output. |
| * |
| * @throws Exception |
| */ |
| public void testChainMapNoOuptut() throws Exception { |
| Configuration conf = createJobConf(); |
| String expectedOutput = ""; |
| |
| Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 1, 0, input); |
| job.setJobName("chain"); |
| |
| ChainMapper.addMapper(job, ConsumeMap.class, IntWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| ChainMapper.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| job.waitForCompletion(true); |
| assertTrue("Job failed", job.isSuccessful()); |
| assertEquals("Outputs doesn't match", expectedOutput, MapReduceTestUtil |
| .readOutput(outDir, conf)); |
| } |
| |
| /** |
| * Tests reducer consuming output. |
| * |
| * @throws Exception |
| */ |
| public void testChainReduceNoOuptut() throws Exception { |
| Configuration conf = createJobConf(); |
| String expectedOutput = ""; |
| |
| Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 1, 1, input); |
| job.setJobName("chain"); |
| |
| ChainMapper.addMapper(job, Mapper.class, IntWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| ChainReducer.setReducer(job, ConsumeReduce.class, LongWritable.class, |
| Text.class, LongWritable.class, Text.class, null); |
| |
| ChainReducer.addMapper(job, Mapper.class, LongWritable.class, Text.class, |
| LongWritable.class, Text.class, null); |
| |
| job.waitForCompletion(true); |
| assertTrue("Job failed", job.isSuccessful()); |
| assertEquals("Outputs doesn't match", expectedOutput, MapReduceTestUtil |
| .readOutput(outDir, conf)); |
| } |
| |
| // this map consumes all the input and output nothing |
| public static class ConsumeMap extends |
| Mapper<LongWritable, Text, LongWritable, Text> { |
| public void map(LongWritable key, Text value, Context context) |
| throws IOException, InterruptedException { |
| } |
| } |
| |
| // this reduce consumes all the input and output nothing |
| public static class ConsumeReduce extends |
| Reducer<LongWritable, Text, LongWritable, Text> { |
| public void reduce(LongWritable key, Iterable<Text> values, Context context) |
| throws IOException, InterruptedException { |
| } |
| } |
| |
| // this map throws IOException for input value "b" |
| public static class FailMap extends |
| Mapper<LongWritable, Text, IntWritable, Text> { |
| protected void map(LongWritable key, Text value, Context context) |
| throws IOException, InterruptedException { |
| if (value.toString().equals("b")) { |
| throw new IOException(); |
| } |
| } |
| } |
| |
| // this reduce throws IOEexception for any input |
| public static class FailReduce extends |
| Reducer<LongWritable, Text, LongWritable, Text> { |
| public void reduce(LongWritable key, Iterable<Text> values, Context context) |
| throws IOException, InterruptedException { |
| throw new IOException(); |
| } |
| } |
| } |