/**
* 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.*;
import java.util.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.*;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.filecache.*;
import java.net.URI;
import junit.framework.Assert;
public class MRCaching {
static String testStr = "This is a test file " + "used for testing caching "
+ "jars, zip and normal files.";
/**
* Using the wordcount example and adding caching to it. The cache
* archives/files are set and then are checked in the map if they have been
* localized or not.
*/
public static class MapClass extends MapReduceBase
implements Mapper<LongWritable, Text, Text, IntWritable> {
JobConf conf;
private final static IntWritable one = new IntWritable(1);
private Text word = new Text();
public void configure(JobConf jconf) {
conf = jconf;
try {
Path[] localArchives = DistributedCache.getLocalCacheArchives(conf);
Path[] localFiles = DistributedCache.getLocalCacheFiles(conf);
// read the cached files (unzipped, unjarred and text)
// and put it into a single file TEST_ROOT_DIR/test.txt
String TEST_ROOT_DIR = jconf.get("test.build.data","/tmp");
Path file = new Path("file:///", TEST_ROOT_DIR);
FileSystem fs = FileSystem.getLocal(conf);
if (!fs.mkdirs(file)) {
throw new IOException("Mkdirs failed to create " + file.toString());
}
Path fileOut = new Path(file, "test.txt");
fs.delete(fileOut, true);
DataOutputStream out = fs.create(fileOut);
for (int i = 0; i < localArchives.length; i++) {
// read out the files from these archives
File f = new File(localArchives[i].toString());
File txt = new File(f, "test.txt");
FileInputStream fin = new FileInputStream(txt);
DataInputStream din = new DataInputStream(fin);
String str = din.readLine();
din.close();
out.writeBytes(str);
out.writeBytes("\n");
}
for (int i = 0; i < localFiles.length; i++) {
// read out the files from these archives
File txt = new File(localFiles[i].toString());
FileInputStream fin = new FileInputStream(txt);
DataInputStream din = new DataInputStream(fin);
String str = din.readLine();
out.writeBytes(str);
out.writeBytes("\n");
}
out.close();
} catch (IOException ie) {
System.out.println(StringUtils.stringifyException(ie));
}
}
public void map(LongWritable key, Text value,
OutputCollector<Text, IntWritable> output,
Reporter reporter) throws IOException {
String line = value.toString();
StringTokenizer itr = new StringTokenizer(line);
while (itr.hasMoreTokens()) {
word.set(itr.nextToken());
output.collect(word, one);
}
}
}
/**
* Using the wordcount example and adding caching to it. The cache
* archives/files are set and then are checked in the map if they have been
* symlinked or not.
*/
public static class MapClass2 extends MapClass {
JobConf conf;
public void configure(JobConf jconf) {
conf = jconf;
try {
// read the cached files (unzipped, unjarred and text)
// and put it into a single file TEST_ROOT_DIR/test.txt
String TEST_ROOT_DIR = jconf.get("test.build.data","/tmp");
Path file = new Path("file:///", TEST_ROOT_DIR);
FileSystem fs = FileSystem.getLocal(conf);
if (!fs.mkdirs(file)) {
throw new IOException("Mkdirs failed to create " + file.toString());
}
Path fileOut = new Path(file, "test.txt");
fs.delete(fileOut, true);
DataOutputStream out = fs.create(fileOut);
String[] symlinks = new String[6];
symlinks[0] = ".";
symlinks[1] = "testjar";
symlinks[2] = "testzip";
symlinks[3] = "testtgz";
symlinks[4] = "testtargz";
symlinks[5] = "testtar";
for (int i = 0; i < symlinks.length; i++) {
// read out the files from these archives
File f = new File(symlinks[i]);
File txt = new File(f, "test.txt");
FileInputStream fin = new FileInputStream(txt);
BufferedReader reader = new BufferedReader(new InputStreamReader(fin));
String str = reader.readLine();
reader.close();
out.writeBytes(str);
out.writeBytes("\n");
}
out.close();
} catch (IOException ie) {
System.out.println(StringUtils.stringifyException(ie));
}
}
}
/**
* A reducer class that just emits the sum of the input values.
*/
public static class ReduceClass extends MapReduceBase
implements Reducer<Text, IntWritable, Text, IntWritable> {
public void reduce(Text key, Iterator<IntWritable> values,
OutputCollector<Text, IntWritable> output,
Reporter reporter) throws IOException {
int sum = 0;
while (values.hasNext()) {
sum += values.next().get();
}
output.collect(key, new IntWritable(sum));
}
}
public static class TestResult {
public RunningJob job;
public boolean isOutputOk;
TestResult(RunningJob job, boolean isOutputOk) {
this.job = job;
this.isOutputOk = isOutputOk;
}
}
static void setupCache(String cacheDir, FileSystem fs)
throws IOException {
Path localPath = new Path("build/test/cache");
Path txtPath = new Path(localPath, new Path("test.txt"));
Path jarPath = new Path(localPath, new Path("test.jar"));
Path zipPath = new Path(localPath, new Path("test.zip"));
Path tarPath = new Path(localPath, new Path("test.tgz"));
Path tarPath1 = new Path(localPath, new Path("test.tar.gz"));
Path tarPath2 = new Path(localPath, new Path("test.tar"));
Path cachePath = new Path(cacheDir);
fs.delete(cachePath, true);
if (!fs.mkdirs(cachePath)) {
throw new IOException("Mkdirs failed to create " + cachePath.toString());
}
fs.copyFromLocalFile(txtPath, cachePath);
fs.copyFromLocalFile(jarPath, cachePath);
fs.copyFromLocalFile(zipPath, cachePath);
fs.copyFromLocalFile(tarPath, cachePath);
fs.copyFromLocalFile(tarPath1, cachePath);
fs.copyFromLocalFile(tarPath2, cachePath);
}
public static TestResult launchMRCache(String indir,
String outdir, String cacheDir,
JobConf conf, String input)
throws IOException {
setupCache(cacheDir, FileSystem.get(conf));
return launchMRCache(indir,outdir, cacheDir, conf, input, false);
}
public static TestResult launchMRCache(String indir,
String outdir, String cacheDir,
JobConf conf, String input,
boolean withSymlink)
throws IOException {
String TEST_ROOT_DIR = new Path(System.getProperty("test.build.data","/tmp"))
.toString().replace(' ', '+');
//if (TEST_ROOT_DIR.startsWith("C:")) TEST_ROOT_DIR = "/tmp";
conf.set("test.build.data", TEST_ROOT_DIR);
final Path inDir = new Path(indir);
final Path outDir = new Path(outdir);
FileSystem fs = FileSystem.get(conf);
fs.delete(outDir, true);
if (!fs.mkdirs(inDir)) {
throw new IOException("Mkdirs failed to create " + inDir.toString());
}
{
System.out.println("HERE:"+inDir);
DataOutputStream file = fs.create(new Path(inDir, "part-0"));
file.writeBytes(input);
file.close();
}
conf.setJobName("cachetest");
// the keys are words (strings)
conf.setOutputKeyClass(Text.class);
// the values are counts (ints)
conf.setOutputValueClass(IntWritable.class);
conf.setCombinerClass(MRCaching.ReduceClass.class);
conf.setReducerClass(MRCaching.ReduceClass.class);
FileInputFormat.setInputPaths(conf, inDir);
FileOutputFormat.setOutputPath(conf, outDir);
conf.setNumMapTasks(1);
conf.setNumReduceTasks(1);
conf.setSpeculativeExecution(false);
URI[] uris = new URI[6];
if (!withSymlink) {
conf.setMapperClass(MRCaching.MapClass.class);
uris[0] = fs.getUri().resolve(cacheDir + "/test.txt");
uris[1] = fs.getUri().resolve(cacheDir + "/test.jar");
uris[2] = fs.getUri().resolve(cacheDir + "/test.zip");
uris[3] = fs.getUri().resolve(cacheDir + "/test.tgz");
uris[4] = fs.getUri().resolve(cacheDir + "/test.tar.gz");
uris[5] = fs.getUri().resolve(cacheDir + "/test.tar");
} else {
DistributedCache.createSymlink(conf);
conf.setMapperClass(MRCaching.MapClass2.class);
uris[0] = fs.getUri().resolve(cacheDir + "/test.txt#" + "test.txt");
uris[1] = fs.getUri().resolve(cacheDir + "/test.jar#" + "testjar");
uris[2] = fs.getUri().resolve(cacheDir + "/test.zip#" + "testzip");
uris[3] = fs.getUri().resolve(cacheDir + "/test.tgz#" + "testtgz");
uris[4] = fs.getUri().resolve(cacheDir + "/test.tar.gz#" + "testtargz");
uris[5] = fs.getUri().resolve(cacheDir + "/test.tar#" + "testtar");
}
//Add files to DC and track their sizes
DistributedCache.addCacheFile(uris[0], conf);
long[] fileSizes = new long[1];
fileSizes[0] = fs.getFileStatus(new Path(uris[0].getPath())).getLen();
long archivesSizes[] = new long[5];
for (int i = 1; i < 6; i++) {
DistributedCache.addCacheArchive(uris[i], conf);
archivesSizes[i-1] =
fs.getFileStatus(new Path(uris[i].getPath())).getLen();
}
// Run the job
RunningJob job = JobClient.runJob(conf);
int count = 0;
// after the job ran check to see if the input from the localized cache
// match the real string. check if there are 3 instances or not.
Path result = new Path(TEST_ROOT_DIR + "/test.txt");
{
BufferedReader file = new BufferedReader
(new InputStreamReader(FileSystem.getLocal(conf).open(result)));
String line = file.readLine();
while (line != null) {
if (!testStr.equals(line))
return new TestResult(job, false);
count++;
line = file.readLine();
}
file.close();
}
if (count != 6)
return new TestResult(job, false);
// Check to ensure the filesizes of files in DC were correctly saved
validateCacheFilesSizes(conf, fileSizes, DistributedCache.CACHE_FILES_SIZES);
validateCacheFilesSizes(conf, archivesSizes,
DistributedCache.CACHE_ARCHIVES_SIZES);
return new TestResult(job, true);
}
private static void validateCacheFilesSizes(JobConf job,
long[] expectedSizes, String configKey)
throws IOException {
String configValues = job.get(configKey, "");
System.out.println(configKey + " -> " + configValues);
String[] realSizes = StringUtils.getStrings(configValues);
Assert.assertEquals("Found " + realSizes.length + " file-sizes for " +
configKey + " (" + configValues + "), expected: " +
expectedSizes.length,
expectedSizes.length, realSizes.length);
for (int i=0; i < expectedSizes.length; ++i) {
long actual = Long.valueOf(realSizes[i]);
long expected = expectedSizes[i];
Assert.assertEquals("Found length: " + actual + ", while expected: " +
expected,
expected, actual);
}
}
}