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Scalable machine learning libraries
/**
* 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.mahout.common;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.mahout.common.iterator.sequencefile.PathType;
import org.apache.mahout.common.iterator.sequencefile.SequenceFileDirValueIterator;
import org.apache.mahout.common.iterator.sequencefile.SequenceFileValueIterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class HadoopUtil {
private static final Logger log = LoggerFactory.getLogger(HadoopUtil.class);
private HadoopUtil() { }
/**
* Create a map-only Hadoop Job out of the passed in parameters. Does not set the
* Job name.
*
* @see #getCustomJobName(String, org.apache.hadoop.mapreduce.JobContext, Class, Class)
*/
public static Job prepareJob(Path inputPath,
Path outputPath,
Class inputFormat,
Class mapper,
Class mapperKey,
Class mapperValue,
Class outputFormat, Configuration conf) throws IOException {
Job job = new Job(new Configuration(conf));
Configuration jobConf = job.getConfiguration();
if (mapper.equals(Mapper.class)) {
throw new IllegalStateException("Can't figure out the user class jar file from mapper/reducer");
}
job.setJarByClass(mapper);
job.setInputFormatClass(inputFormat);
jobConf.set("mapred.input.dir", inputPath.toString());
job.setMapperClass(mapper);
job.setMapOutputKeyClass(mapperKey);
job.setMapOutputValueClass(mapperValue);
job.setOutputKeyClass(mapperKey);
job.setOutputValueClass(mapperValue);
jobConf.setBoolean("mapred.compress.map.output", true);
job.setNumReduceTasks(0);
job.setOutputFormatClass(outputFormat);
jobConf.set("mapred.output.dir", outputPath.toString());
return job;
}
/**
* Create a map and reduce Hadoop job. Does not set the name on the job.
* @param inputPath The input {@link org.apache.hadoop.fs.Path}
* @param outputPath The output {@link org.apache.hadoop.fs.Path}
* @param inputFormat The {@link org.apache.hadoop.mapreduce.InputFormat}
* @param mapper The {@link org.apache.hadoop.mapreduce.Mapper} class to use
* @param mapperKey The {@link org.apache.hadoop.io.Writable} key class. If the Mapper is a no-op,
* this value may be null
* @param mapperValue The {@link org.apache.hadoop.io.Writable} value class. If the Mapper is a no-op,
* this value may be null
* @param reducer The {@link org.apache.hadoop.mapreduce.Reducer} to use
* @param reducerKey The reducer key class.
* @param reducerValue The reducer value class.
* @param outputFormat The {@link org.apache.hadoop.mapreduce.OutputFormat}.
* @param conf The {@link org.apache.hadoop.conf.Configuration} to use.
* @return The {@link org.apache.hadoop.mapreduce.Job}.
* @throws IOException if there is a problem with the IO.
*
* @see #getCustomJobName(String, org.apache.hadoop.mapreduce.JobContext, Class, Class)
* @see #prepareJob(org.apache.hadoop.fs.Path, org.apache.hadoop.fs.Path, Class, Class, Class, Class, Class,
* org.apache.hadoop.conf.Configuration)
*/
public static Job prepareJob(Path inputPath,
Path outputPath,
Class inputFormat,
Class mapper,
Class mapperKey,
Class mapperValue,
Class reducer,
Class reducerKey,
Class reducerValue,
Class outputFormat,
Configuration conf) throws IOException {
Job job = new Job(new Configuration(conf));
Configuration jobConf = job.getConfiguration();
if (reducer.equals(Reducer.class)) {
if (mapper.equals(Mapper.class)) {
throw new IllegalStateException("Can't figure out the user class jar file from mapper/reducer");
}
job.setJarByClass(mapper);
} else {
job.setJarByClass(reducer);
}
job.setInputFormatClass(inputFormat);
jobConf.set("mapred.input.dir", inputPath.toString());
job.setMapperClass(mapper);
if (mapperKey != null) {
job.setMapOutputKeyClass(mapperKey);
}
if (mapperValue != null) {
job.setMapOutputValueClass(mapperValue);
}
jobConf.setBoolean("mapred.compress.map.output", true);
job.setReducerClass(reducer);
job.setOutputKeyClass(reducerKey);
job.setOutputValueClass(reducerValue);
job.setOutputFormatClass(outputFormat);
jobConf.set("mapred.output.dir", outputPath.toString());
return job;
}
public static String getCustomJobName(String className, JobContext job,
Class mapper,
Class reducer) {
StringBuilder name = new StringBuilder(100);
String customJobName = job.getJobName();
if (customJobName == null || customJobName.trim().isEmpty()) {
name.append(className);
} else {
name.append(customJobName);
}
name.append('-').append(mapper.getSimpleName());
name.append('-').append(reducer.getSimpleName());
return name.toString();
}
public static void delete(Configuration conf, Iterable paths) throws IOException {
if (conf == null) {
conf = new Configuration();
}
for (Path path : paths) {
FileSystem fs = path.getFileSystem(conf);
if (fs.exists(path)) {
log.info("Deleting {}", path);
fs.delete(path, true);
}
}
}
public static void delete(Configuration conf, Path... paths) throws IOException {
delete(conf, Arrays.asList(paths));
}
public static long countRecords(Path path, Configuration conf) throws IOException {
long count = 0;
Iterator iterator = new SequenceFileValueIterator(path, true, conf);
while (iterator.hasNext()) {
iterator.next();
count++;
}
return count;
}
/**
* Count all the records in a directory using a
* {@link org.apache.mahout.common.iterator.sequencefile.SequenceFileDirValueIterator}
*
* @param path The {@link org.apache.hadoop.fs.Path} to count
* @param pt The {@link org.apache.mahout.common.iterator.sequencefile.PathType}
* @param filter Apply the {@link org.apache.hadoop.fs.PathFilter}. May be null
* @param conf The Hadoop {@link org.apache.hadoop.conf.Configuration}
* @return The number of records
* @throws IOException if there was an IO error
*/
public static long countRecords(Path path, PathType pt, PathFilter filter, Configuration conf) throws IOException {
long count = 0;
Iterator iterator = new SequenceFileDirValueIterator(path, pt, filter, null, true, conf);
while (iterator.hasNext()) {
iterator.next();
count++;
}
return count;
}
public static InputStream openStream(Path path, Configuration conf) throws IOException {
FileSystem fs = FileSystem.get(path.toUri(), conf);
return fs.open(path.makeQualified(path.toUri(), path));
}
public static FileStatus[] getFileStatus(Path path, PathType pathType, PathFilter filter,
Comparator ordering, Configuration conf) throws IOException {
FileStatus[] statuses;
FileSystem fs = path.getFileSystem(conf);
if (filter == null) {
statuses = pathType == PathType.GLOB ? fs.globStatus(path) : listStatus(fs, path);
} else {
statuses = pathType == PathType.GLOB ? fs.globStatus(path, filter) : listStatus(fs, path, filter);
}
if (ordering != null) {
Arrays.sort(statuses, ordering);
}
return statuses;
}
public static FileStatus[] listStatus(FileSystem fs, Path path) throws IOException {
try {
return fs.listStatus(path);
} catch (FileNotFoundException e) {
return new FileStatus[0];
}
}
public static FileStatus[] listStatus(FileSystem fs, Path path, PathFilter filter) throws IOException {
try {
return fs.listStatus(path, filter);
} catch (FileNotFoundException e) {
return new FileStatus[0];
}
}
public static void cacheFiles(Path fileToCache, Configuration conf) {
DistributedCache.setCacheFiles(new URI[]{fileToCache.toUri()}, conf);
}
/**
* Return the first cached file in the list, else null if thre are no cached files.
* @param conf - MapReduce Configuration
* @return Path of Cached file
* @throws IOException - IO Exception
*/
public static Path getSingleCachedFile(Configuration conf) throws IOException {
return getCachedFiles(conf)[0];
}
/**
* Retrieves paths to cached files.
* @param conf - MapReduce Configuration
* @return Path[] of Cached Files
* @throws IOException - IO Exception
* @throws IllegalStateException if no cache files are found
*/
public static Path[] getCachedFiles(Configuration conf) throws IOException {
LocalFileSystem localFs = FileSystem.getLocal(conf);
Path[] cacheFiles = DistributedCache.getLocalCacheFiles(conf);
URI[] fallbackFiles = DistributedCache.getCacheFiles(conf);
// fallback for local execution
if (cacheFiles == null) {
Preconditions.checkState(fallbackFiles != null, "Unable to find cached files!");
cacheFiles = new Path[fallbackFiles.length];
for (int n = 0; n < fallbackFiles.length; n++) {
cacheFiles[n] = new Path(fallbackFiles[n].getPath());
}
} else {
for (int n = 0; n < cacheFiles.length; n++) {
cacheFiles[n] = localFs.makeQualified(cacheFiles[n]);
// fallback for local execution
if (!localFs.exists(cacheFiles[n])) {
cacheFiles[n] = new Path(fallbackFiles[n].getPath());
}
}
}
Preconditions.checkState(cacheFiles.length > 0, "Unable to find cached files!");
return cacheFiles;
}
public static void setSerializations(Configuration configuration) {
configuration.set("io.serializations", "org.apache.hadoop.io.serializer.JavaSerialization,"
+ "org.apache.hadoop.io.serializer.WritableSerialization");
}
public static void writeInt(int value, Path path, Configuration configuration) throws IOException {
FileSystem fs = FileSystem.get(path.toUri(), configuration);
try (FSDataOutputStream out = fs.create(path)) {
out.writeInt(value);
}
}
public static int readInt(Path path, Configuration configuration) throws IOException {
FileSystem fs = FileSystem.get(path.toUri(), configuration);
try (FSDataInputStream in = fs.open(path)) {
return in.readInt();
}
}
/**
* Builds a comma-separated list of input splits
* @param fs - File System
* @param fileStatus - File Status
* @return list of directories as a comma-separated String
* @throws IOException - IO Exception
*/
public static String buildDirList(FileSystem fs, FileStatus fileStatus) throws IOException {
boolean containsFiles = false;
List directoriesList = new ArrayList<>();
for (FileStatus childFileStatus : fs.listStatus(fileStatus.getPath())) {
if (childFileStatus.isDir()) {
String subDirectoryList = buildDirList(fs, childFileStatus);
directoriesList.add(subDirectoryList);
} else {
containsFiles = true;
}
}
if (containsFiles) {
directoriesList.add(fileStatus.getPath().toUri().getPath());
}
return Joiner.on(',').skipNulls().join(directoriesList.iterator());
}
/**
* Builds a comma-separated list of input splits
* @param fs - File System
* @param fileStatus - File Status
* @param pathFilter - path filter
* @return list of directories as a comma-separated String
* @throws IOException - IO Exception
*/
public static String buildDirList(FileSystem fs, FileStatus fileStatus, PathFilter pathFilter) throws IOException {
boolean containsFiles = false;
List directoriesList = new ArrayList<>();
for (FileStatus childFileStatus : fs.listStatus(fileStatus.getPath(), pathFilter)) {
if (childFileStatus.isDir()) {
String subDirectoryList = buildDirList(fs, childFileStatus);
directoriesList.add(subDirectoryList);
} else {
containsFiles = true;
}
}
if (containsFiles) {
directoriesList.add(fileStatus.getPath().toUri().getPath());
}
return Joiner.on(',').skipNulls().join(directoriesList.iterator());
}
/**
*
* @param configuration - configuration
* @param filePath - Input File Path
* @return relative file Path
* @throws IOException - IO Exception
*/
public static String calcRelativeFilePath(Configuration configuration, Path filePath) throws IOException {
FileSystem fs = filePath.getFileSystem(configuration);
FileStatus fst = fs.getFileStatus(filePath);
String currentPath = fst.getPath().toString().replaceFirst("file:", "");
String basePath = configuration.get("baseinputpath");
if (!basePath.endsWith("/")) {
basePath += "/";
}
basePath = basePath.replaceFirst("file:", "");
String[] parts = currentPath.split(basePath);
if (parts.length == 2) {
return parts[1];
} else if (parts.length == 1) {
return parts[0];
}
return currentPath;
}
/**
* Finds a file in the DistributedCache
*
* @param partOfFilename a substring of the file name
* @param localFiles holds references to files stored in distributed cache
* @return Path to first matched file or null if nothing was found
**/
public static Path findInCacheByPartOfFilename(String partOfFilename, URI[] localFiles) {
for (URI distCacheFile : localFiles) {
log.info("trying find a file in distributed cache containing [{}] in its name", partOfFilename);
if (distCacheFile != null && distCacheFile.toString().contains(partOfFilename)) {
log.info("found file [{}] containing [{}]", distCacheFile.toString(), partOfFilename);
return new Path(distCacheFile.getPath());
}
}
return null;
}
}
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