/**
* 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.mapred;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import junit.framework.TestCase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.server.jobtracker.JTConfig;
import org.junit.Assert;
import org.junit.Test;
/**
* A JUnit test to test Mini Map-Reduce Cluster with multiple directories
* and check for correct classpath
*/
public class TestMiniMRClasspath {
static void configureWordCount(FileSystem fs, JobConf conf, String input,
int numMaps, int numReduces, Path inDir, Path outDir) throws IOException {
fs.delete(outDir, true);
if (!fs.mkdirs(inDir)) {
throw new IOException("Mkdirs failed to create " + inDir.toString());
}
DataOutputStream file = fs.create(new Path(inDir, "part-0"));
file.writeBytes(input);
file.close();
FileSystem.setDefaultUri(conf, fs.getUri());
conf.set(JTConfig.FRAMEWORK_NAME, JTConfig.YARN_FRAMEWORK_NAME);
conf.setJobName("wordcount");
conf.setInputFormat(TextInputFormat.class);
// the keys are words (strings)
conf.setOutputKeyClass(Text.class);
// the values are counts (ints)
conf.setOutputValueClass(IntWritable.class);
conf.set("mapred.mapper.class", "testjar.ClassWordCount$MapClass");
conf.set("mapred.combine.class", "testjar.ClassWordCount$Reduce");
conf.set("mapred.reducer.class", "testjar.ClassWordCount$Reduce");
FileInputFormat.setInputPaths(conf, inDir);
FileOutputFormat.setOutputPath(conf, outDir);
conf.setNumMapTasks(numMaps);
conf.setNumReduceTasks(numReduces);
//set the tests jar file
conf.setJarByClass(TestMiniMRClasspath.class);
}
static String launchWordCount(URI fileSys, JobConf conf, String input,
int numMaps, int numReduces)
throws IOException {
final Path inDir = new Path("/testing/wc/input");
final Path outDir = new Path("/testing/wc/output");
FileSystem fs = FileSystem.get(fileSys, conf);
configureWordCount(fs, conf, input, numMaps, numReduces, inDir, outDir);
JobClient.runJob(conf);
StringBuffer result = new StringBuffer();
{
Path[] parents = FileUtil.stat2Paths(fs.listStatus(outDir.getParent()));
Path[] fileList = FileUtil.stat2Paths(fs.listStatus(outDir,
new Utils.OutputFileUtils.OutputFilesFilter()));
for(int i=0; i < fileList.length; ++i) {
BufferedReader file =
new BufferedReader(new InputStreamReader(fs.open(fileList[i])));
String line = file.readLine();
while (line != null) {
result.append(line);
result.append("\n");
line = file.readLine();
}
file.close();
}
}
return result.toString();
}
static String launchExternal(URI uri, JobConf conf, String input,
int numMaps, int numReduces)
throws IOException {
final Path inDir = new Path("/testing/ext/input");
final Path outDir = new Path("/testing/ext/output");
FileSystem fs = FileSystem.get(uri, conf);
fs.delete(outDir, true);
if (!fs.mkdirs(inDir)) {
throw new IOException("Mkdirs failed to create " + inDir.toString());
}
{
DataOutputStream file = fs.create(new Path(inDir, "part-0"));
file.writeBytes(input);
file.close();
}
FileSystem.setDefaultUri(conf, uri);
conf.set(JTConfig.FRAMEWORK_NAME, JTConfig.YARN_FRAMEWORK_NAME);
conf.setJobName("wordcount");
conf.setInputFormat(TextInputFormat.class);
// the keys are counts
conf.setOutputValueClass(IntWritable.class);
// the values are the messages
conf.set(JobContext.OUTPUT_KEY_CLASS, "testjar.ExternalWritable");
FileInputFormat.setInputPaths(conf, inDir);
FileOutputFormat.setOutputPath(conf, outDir);
conf.setNumMapTasks(numMaps);
conf.setNumReduceTasks(numReduces);
conf.set("mapred.mapper.class", "testjar.ExternalMapperReducer");
conf.set("mapred.reducer.class", "testjar.ExternalMapperReducer");
// set the tests jar file
conf.setJarByClass(TestMiniMRClasspath.class);
JobClient.runJob(conf);
StringBuffer result = new StringBuffer();
Path[] fileList = FileUtil.stat2Paths(fs.listStatus(outDir,
new Utils.OutputFileUtils
.OutputFilesFilter()));
for (int i = 0; i < fileList.length; ++i) {
BufferedReader file = new BufferedReader(new InputStreamReader(
fs.open(fileList[i])));
String line = file.readLine();
while (line != null) {
result.append(line);
line = file.readLine();
result.append("\n");
}
file.close();
}
return result.toString();
}
@Test
public void testClassPath() throws IOException {
String namenode = null;
MiniDFSCluster dfs = null;
MiniMRCluster mr = null;
FileSystem fileSys = null;
try {
final int taskTrackers = 4;
final int jobTrackerPort = 60050;
Configuration conf = new Configuration();
dfs = new MiniDFSCluster.Builder(conf).build();
fileSys = dfs.getFileSystem();
namenode = fileSys.getUri().toString();
mr = new MiniMRCluster(taskTrackers, namenode, 3);
JobConf jobConf = mr.createJobConf();
String result;
result = launchWordCount(fileSys.getUri(), jobConf,
"The quick brown fox\nhas many silly\n" + "red fox sox\n", 3, 1);
Assert.assertEquals("The\t1\nbrown\t1\nfox\t2\nhas\t1\nmany\t1\n"
+ "quick\t1\nred\t1\nsilly\t1\nsox\t1\n", result);
} finally {
if (dfs != null) { dfs.shutdown(); }
if (mr != null) { mr.shutdown();
}
}
}
@Test
public void testExternalWritable()
throws IOException {
String namenode = null;
MiniDFSCluster dfs = null;
MiniMRCluster mr = null;
FileSystem fileSys = null;
try {
final int taskTrackers = 4;
Configuration conf = new Configuration();
dfs = new MiniDFSCluster.Builder(conf).build();
fileSys = dfs.getFileSystem();
namenode = fileSys.getUri().toString();
mr = new MiniMRCluster(taskTrackers, namenode, 3);
JobConf jobConf = mr.createJobConf();
String result;
result = launchExternal(fileSys.getUri(), jobConf,
"Dennis was here!\nDennis again!", 3, 1);
Assert.assertEquals("Dennis again!\t1\nDennis was here!\t1\n", result);
}
finally {
if (dfs != null) { dfs.shutdown(); }
if (mr != null) { mr.shutdown();
}
}
}
}