/**
* 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;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.NumberFormat;
import java.util.Iterator;
import java.util.Random;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.OutputLogFilter;
import org.apache.hadoop.mapred.Utils;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* Utility methods used in various Job Control unit tests.
*/
public class MapReduceTestUtil {
public static final Log LOG =
LogFactory.getLog(MapReduceTestUtil.class.getName());
static private Random rand = new Random();
private static NumberFormat idFormat = NumberFormat.getInstance();
static {
idFormat.setMinimumIntegerDigits(4);
idFormat.setGroupingUsed(false);
}
/**
* Cleans the data from the passed Path in the passed FileSystem.
*
* @param fs FileSystem to delete data from.
* @param dirPath Path to be deleted.
* @throws IOException If an error occurs cleaning the data.
*/
public static void cleanData(FileSystem fs, Path dirPath)
throws IOException {
fs.delete(dirPath, true);
}
/**
* Generates a string of random digits.
*
* @return A random string.
*/
public static String generateRandomWord() {
return idFormat.format(rand.nextLong());
}
/**
* Generates a line of random text.
*
* @return A line of random text.
*/
public static String generateRandomLine() {
long r = rand.nextLong() % 7;
long n = r + 20;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < n; i++) {
sb.append(generateRandomWord()).append(" ");
}
sb.append("\n");
return sb.toString();
}
/**
* Generates random data consisting of 10000 lines.
*
* @param fs FileSystem to create data in.
* @param dirPath Path to create the data in.
* @throws IOException If an error occurs creating the data.
*/
public static void generateData(FileSystem fs, Path dirPath)
throws IOException {
FSDataOutputStream out = fs.create(new Path(dirPath, "data.txt"));
for (int i = 0; i < 10000; i++) {
String line = generateRandomLine();
out.write(line.getBytes("UTF-8"));
}
out.close();
}
/**
* Creates a simple copy job.
*
* @param conf Configuration object
* @param outdir Output directory.
* @param indirs Comma separated input directories.
* @return Job initialized for a data copy job.
* @throws Exception If an error occurs creating job configuration.
*/
public static Job createCopyJob(Configuration conf, Path outdir,
Path... indirs) throws Exception {
conf.setInt("mapred.map.tasks", 3);
Job theJob = Job.getInstance(conf);
theJob.setJobName("DataMoveJob");
FileInputFormat.setInputPaths(theJob, indirs);
theJob.setMapperClass(DataCopyMapper.class);
FileOutputFormat.setOutputPath(theJob, outdir);
theJob.setOutputKeyClass(Text.class);
theJob.setOutputValueClass(Text.class);
theJob.setReducerClass(DataCopyReducer.class);
theJob.setNumReduceTasks(1);
return theJob;
}
/**
* Creates a simple fail job.
*
* @param conf Configuration object
* @param outdir Output directory.
* @param indirs Comma separated input directories.
* @return Job initialized for a simple fail job.
* @throws Exception If an error occurs creating job configuration.
*/
public static Job createFailJob(Configuration conf, Path outdir,
Path... indirs) throws Exception {
FileSystem fs = outdir.getFileSystem(conf);
if (fs.exists(outdir)) {
fs.delete(outdir, true);
}
conf.setInt("mapred.map.max.attempts", 2);
Job theJob = Job.getInstance(conf);
theJob.setJobName("Fail-Job");
FileInputFormat.setInputPaths(theJob, indirs);
theJob.setMapperClass(FailMapper.class);
theJob.setReducerClass(Reducer.class);
theJob.setNumReduceTasks(0);
FileOutputFormat.setOutputPath(theJob, outdir);
theJob.setOutputKeyClass(Text.class);
theJob.setOutputValueClass(Text.class);
return theJob;
}
/**
* Creates a simple fail job.
*
* @param conf Configuration object
* @param outdir Output directory.
* @param indirs Comma separated input directories.
* @return Job initialized for a simple kill job.
* @throws Exception If an error occurs creating job configuration.
*/
public static Job createKillJob(Configuration conf, Path outdir,
Path... indirs) throws Exception {
Job theJob = Job.getInstance(conf);
theJob.setJobName("Kill-Job");
FileInputFormat.setInputPaths(theJob, indirs);
theJob.setMapperClass(KillMapper.class);
theJob.setReducerClass(Reducer.class);
theJob.setNumReduceTasks(0);
FileOutputFormat.setOutputPath(theJob, outdir);
theJob.setOutputKeyClass(Text.class);
theJob.setOutputValueClass(Text.class);
return theJob;
}
/**
* Simple Mapper and Reducer implementation which copies data it reads in.
*/
public static class DataCopyMapper extends
Mapper<LongWritable, Text, Text, Text> {
public void map(LongWritable key, Text value, Context context)
throws IOException, InterruptedException {
context.write(new Text(key.toString()), value);
}
}
public static class DataCopyReducer extends Reducer<Text, Text, Text, Text> {
public void reduce(Text key, Iterator<Text> values, Context context)
throws IOException, InterruptedException {
Text dumbKey = new Text("");
while (values.hasNext()) {
Text data = (Text) values.next();
context.write(dumbKey, data);
}
}
}
// Mapper that fails
public static class FailMapper extends
Mapper<WritableComparable<?>, Writable, WritableComparable<?>, Writable> {
public void map(WritableComparable<?> key, Writable value, Context context)
throws IOException {
throw new RuntimeException("failing map");
}
}
// Mapper that sleeps for a long time.
// Used for running a job that will be killed
public static class KillMapper extends
Mapper<WritableComparable<?>, Writable, WritableComparable<?>, Writable> {
public void map(WritableComparable<?> key, Writable value, Context context)
throws IOException {
try {
Thread.sleep(1000000);
} catch (InterruptedException e) {
// Do nothing
}
}
}
public static Job createJob(Configuration conf, Path inDir, Path outDir,
int numInputFiles, int numReds) throws IOException {
String input = "The quick brown fox\n" + "has many silly\n"
+ "red fox sox\n";
return createJob(conf, inDir, outDir, numInputFiles, numReds, input);
}
public static Job createJob(Configuration conf, Path inDir, Path outDir,
int numInputFiles, int numReds, String input) throws IOException {
Job job = Job.getInstance(conf);
FileSystem fs = FileSystem.get(conf);
if (fs.exists(outDir)) {
fs.delete(outDir, true);
}
if (fs.exists(inDir)) {
fs.delete(inDir, true);
}
fs.mkdirs(inDir);
for (int i = 0; i < numInputFiles; ++i) {
DataOutputStream file = fs.create(new Path(inDir, "part-" + i));
file.writeBytes(input);
file.close();
}
FileInputFormat.setInputPaths(job, inDir);
FileOutputFormat.setOutputPath(job, outDir);
job.setNumReduceTasks(numReds);
return job;
}
public static TaskAttemptContext createDummyMapTaskAttemptContext(
Configuration conf) {
TaskAttemptID tid = new TaskAttemptID("jt", 1, true, 0, 0);
conf.set("mapred.task.id", tid.toString());
return new TaskAttemptContext(conf, tid);
}
public static StatusReporter createDummyReporter() {
return new StatusReporter() {
public void setStatus(String s) {
}
public void progress() {
}
@Override
public float getProgress() {
return 0;
}
public Counter getCounter(Enum<?> name) {
return new Counters().findCounter(name);
}
public Counter getCounter(String group, String name) {
return new Counters().findCounter(group, name);
}
};
}
public static String readOutput(Path outDir, Configuration conf)
throws IOException {
FileSystem fs = outDir.getFileSystem(conf);
StringBuffer result = new StringBuffer();
Path[] fileList = FileUtil.stat2Paths(fs.listStatus(outDir,
new Utils.OutputFileUtils.OutputFilesFilter()));
for (Path outputFile : fileList) {
LOG.info("Path" + ": "+ outputFile);
BufferedReader file =
new BufferedReader(new InputStreamReader(fs.open(outputFile)));
String line = file.readLine();
while (line != null) {
result.append(line);
result.append("\n");
line = file.readLine();
}
file.close();
}
return result.toString();
}
}