/**
* 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.pipes;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.StringTokenizer;
import org.apache.commons.cli.BasicParser;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.OptionGroup;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.Parser;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputFormat;
import org.apache.hadoop.mapred.Partitioner;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.RunningJob;
import org.apache.hadoop.mapred.lib.HashPartitioner;
import org.apache.hadoop.mapred.lib.NullOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.Tool;
/**
* The main entry point and job submitter. It may either be used as a command
* line-based or API-based method to launch Pipes jobs.
*/
public class Submitter extends Configured implements Tool {
protected static final Log LOG = LogFactory.getLog(Submitter.class);
public Submitter() {
this(new Configuration());
}
public Submitter(Configuration conf) {
setConf(conf);
}
/**
* Get the URI of the application's executable.
* @param conf
* @return the URI where the application's executable is located
*/
public static String getExecutable(JobConf conf) {
return conf.get("hadoop.pipes.executable");
}
/**
* Set the URI for the application's executable. Normally this is a hdfs:
* location.
* @param conf
* @param executable The URI of the application's executable.
*/
public static void setExecutable(JobConf conf, String executable) {
conf.set("hadoop.pipes.executable", executable);
}
/**
* Set whether the job is using a Java RecordReader.
* @param conf the configuration to modify
* @param value the new value
*/
public static void setIsJavaRecordReader(JobConf conf, boolean value) {
conf.setBoolean("hadoop.pipes.java.recordreader", value);
}
/**
* Check whether the job is using a Java RecordReader
* @param conf the configuration to check
* @return is it a Java RecordReader?
*/
public static boolean getIsJavaRecordReader(JobConf conf) {
return conf.getBoolean("hadoop.pipes.java.recordreader", false);
}
/**
* Set whether the Mapper is written in Java.
* @param conf the configuration to modify
* @param value the new value
*/
public static void setIsJavaMapper(JobConf conf, boolean value) {
conf.setBoolean("hadoop.pipes.java.mapper", value);
}
/**
* Check whether the job is using a Java Mapper.
* @param conf the configuration to check
* @return is it a Java Mapper?
*/
public static boolean getIsJavaMapper(JobConf conf) {
return conf.getBoolean("hadoop.pipes.java.mapper", false);
}
/**
* Set whether the Reducer is written in Java.
* @param conf the configuration to modify
* @param value the new value
*/
public static void setIsJavaReducer(JobConf conf, boolean value) {
conf.setBoolean("hadoop.pipes.java.reducer", value);
}
/**
* Check whether the job is using a Java Reducer.
* @param conf the configuration to check
* @return is it a Java Reducer?
*/
public static boolean getIsJavaReducer(JobConf conf) {
return conf.getBoolean("hadoop.pipes.java.reducer", false);
}
/**
* Set whether the job will use a Java RecordWriter.
* @param conf the configuration to modify
* @param value the new value to set
*/
public static void setIsJavaRecordWriter(JobConf conf, boolean value) {
conf.setBoolean("hadoop.pipes.java.recordwriter", value);
}
/**
* Will the reduce use a Java RecordWriter?
* @param conf the configuration to check
* @return true, if the output of the job will be written by Java
*/
public static boolean getIsJavaRecordWriter(JobConf conf) {
return conf.getBoolean("hadoop.pipes.java.recordwriter", false);
}
/**
* Set the configuration, if it doesn't already have a value for the given
* key.
* @param conf the configuration to modify
* @param key the key to set
* @param value the new "default" value to set
*/
private static void setIfUnset(JobConf conf, String key, String value) {
if (conf.get(key) == null) {
conf.set(key, value);
}
}
/**
* Save away the user's original partitioner before we override it.
* @param conf the configuration to modify
* @param cls the user's partitioner class
*/
static void setJavaPartitioner(JobConf conf, Class cls) {
conf.set("hadoop.pipes.partitioner", cls.getName());
}
/**
* Get the user's original partitioner.
* @param conf the configuration to look in
* @return the class that the user submitted
*/
static Class<? extends Partitioner> getJavaPartitioner(JobConf conf) {
return conf.getClass("hadoop.pipes.partitioner",
HashPartitioner.class,
Partitioner.class);
}
/**
* Does the user want to keep the command file for debugging? If this is
* true, pipes will write a copy of the command data to a file in the
* task directory named "downlink.data", which may be used to run the C++
* program under the debugger. You probably also want to set
* JobConf.setKeepFailedTaskFiles(true) to keep the entire directory from
* being deleted.
* To run using the data file, set the environment variable
* "hadoop.pipes.command.file" to point to the file.
* @param conf the configuration to check
* @return will the framework save the command file?
*/
public static boolean getKeepCommandFile(JobConf conf) {
return conf.getBoolean("hadoop.pipes.command-file.keep", false);
}
/**
* Set whether to keep the command file for debugging
* @param conf the configuration to modify
* @param keep the new value
*/
public static void setKeepCommandFile(JobConf conf, boolean keep) {
conf.setBoolean("hadoop.pipes.command-file.keep", keep);
}
/**
* Submit a job to the map/reduce cluster. All of the necessary modifications
* to the job to run under pipes are made to the configuration.
* @param conf the job to submit to the cluster (MODIFIED)
* @throws IOException
* @deprecated Use {@link Submitter#runJob(JobConf)}
*/
@Deprecated
public static RunningJob submitJob(JobConf conf) throws IOException {
return runJob(conf);
}
/**
* Submit a job to the map/reduce cluster. All of the necessary modifications
* to the job to run under pipes are made to the configuration.
* @param conf the job to submit to the cluster (MODIFIED)
* @throws IOException
*/
public static RunningJob runJob(JobConf conf) throws IOException {
setupPipesJob(conf);
return JobClient.runJob(conf);
}
/**
* Submit a job to the Map-Reduce framework.
* This returns a handle to the {@link RunningJob} which can be used to track
* the running-job.
*
* @param conf the job configuration.
* @return a handle to the {@link RunningJob} which can be used to track the
* running-job.
* @throws IOException
*/
public static RunningJob jobSubmit(JobConf conf) throws IOException {
setupPipesJob(conf);
return new JobClient(conf).submitJob(conf);
}
private static void setupPipesJob(JobConf conf) throws IOException {
// default map output types to Text
if (!getIsJavaMapper(conf)) {
conf.setMapRunnerClass(PipesMapRunner.class);
// Save the user's partitioner and hook in our's.
setJavaPartitioner(conf, conf.getPartitionerClass());
conf.setPartitionerClass(PipesPartitioner.class);
}
if (!getIsJavaReducer(conf)) {
conf.setReducerClass(PipesReducer.class);
if (!getIsJavaRecordWriter(conf)) {
conf.setOutputFormat(NullOutputFormat.class);
}
}
String textClassname = Text.class.getName();
setIfUnset(conf, "mapred.mapoutput.key.class", textClassname);
setIfUnset(conf, "mapred.mapoutput.value.class", textClassname);
setIfUnset(conf, "mapred.output.key.class", textClassname);
setIfUnset(conf, "mapred.output.value.class", textClassname);
// Use PipesNonJavaInputFormat if necessary to handle progress reporting
// from C++ RecordReaders ...
if (!getIsJavaRecordReader(conf) && !getIsJavaMapper(conf)) {
conf.setClass("mapred.pipes.user.inputformat",
conf.getInputFormat().getClass(), InputFormat.class);
conf.setInputFormat(PipesNonJavaInputFormat.class);
}
String exec = getExecutable(conf);
if (exec == null) {
throw new IllegalArgumentException("No application program defined.");
}
// add default debug script only when executable is expressed as
// <path>#<executable>
if (exec.contains("#")) {
DistributedCache.createSymlink(conf);
// set default gdb commands for map and reduce task
String defScript = "$HADOOP_HOME/src/c++/pipes/debug/pipes-default-script";
setIfUnset(conf,"mapred.map.task.debug.script",defScript);
setIfUnset(conf,"mapred.reduce.task.debug.script",defScript);
}
URI[] fileCache = DistributedCache.getCacheFiles(conf);
if (fileCache == null) {
fileCache = new URI[1];
} else {
URI[] tmp = new URI[fileCache.length+1];
System.arraycopy(fileCache, 0, tmp, 1, fileCache.length);
fileCache = tmp;
}
try {
fileCache[0] = new URI(exec);
} catch (URISyntaxException e) {
IOException ie = new IOException("Problem parsing execable URI " + exec);
ie.initCause(e);
throw ie;
}
DistributedCache.setCacheFiles(fileCache, conf);
}
/**
* A command line parser for the CLI-based Pipes job submitter.
*/
static class CommandLineParser {
private Options options = new Options();
void addOption(String longName, boolean required, String description,
String paramName) {
Option option = OptionBuilder.withArgName(paramName).hasArgs(1).withDescription(description).isRequired(required).create(longName);
options.addOption(option);
}
void addArgument(String name, boolean required, String description) {
Option option = OptionBuilder.withArgName(name).hasArgs(1).withDescription(description).isRequired(required).create();
options.addOption(option);
}
Parser createParser() {
Parser result = new BasicParser();
return result;
}
void printUsage() {
// The CLI package should do this for us, but I can't figure out how
// to make it print something reasonable.
System.out.println("bin/hadoop pipes");
System.out.println(" [-input <path>] // Input directory");
System.out.println(" [-output <path>] // Output directory");
System.out.println(" [-jar <jar file> // jar filename");
System.out.println(" [-inputformat <class>] // InputFormat class");
System.out.println(" [-map <class>] // Java Map class");
System.out.println(" [-partitioner <class>] // Java Partitioner");
System.out.println(" [-reduce <class>] // Java Reduce class");
System.out.println(" [-writer <class>] // Java RecordWriter");
System.out.println(" [-program <executable>] // executable URI");
System.out.println(" [-reduces <num>] // number of reduces");
System.out.println();
GenericOptionsParser.printGenericCommandUsage(System.out);
}
}
private static <InterfaceType>
Class<? extends InterfaceType> getClass(CommandLine cl, String key,
JobConf conf,
Class<InterfaceType> cls
) throws ClassNotFoundException {
return conf.getClassByName((String) cl.getOptionValue(key)).asSubclass(cls);
}
@Override
public int run(String[] args) throws Exception {
CommandLineParser cli = new CommandLineParser();
if (args.length == 0) {
cli.printUsage();
return 1;
}
cli.addOption("input", false, "input path to the maps", "path");
cli.addOption("output", false, "output path from the reduces", "path");
cli.addOption("jar", false, "job jar file", "path");
cli.addOption("inputformat", false, "java classname of InputFormat",
"class");
//cli.addArgument("javareader", false, "is the RecordReader in Java");
cli.addOption("map", false, "java classname of Mapper", "class");
cli.addOption("partitioner", false, "java classname of Partitioner",
"class");
cli.addOption("reduce", false, "java classname of Reducer", "class");
cli.addOption("writer", false, "java classname of OutputFormat", "class");
cli.addOption("program", false, "URI to application executable", "class");
cli.addOption("reduces", false, "number of reduces", "num");
cli.addOption("jobconf", false,
"\"n1=v1,n2=v2,..\" (Deprecated) Optional. Add or override a JobConf property.",
"key=val");
Parser parser = cli.createParser();
try {
GenericOptionsParser genericParser = new GenericOptionsParser(getConf(), args);
CommandLine results =
parser.parse(cli.options, genericParser.getRemainingArgs());
JobConf job = new JobConf(getConf());
if (results.hasOption("input")) {
FileInputFormat.setInputPaths(job,
(String) results.getOptionValue("input"));
}
if (results.hasOption("output")) {
FileOutputFormat.setOutputPath(job,
new Path((String) results.getOptionValue("output")));
}
if (results.hasOption("jar")) {
job.setJar((String) results.getOptionValue("jar"));
}
if (results.hasOption("inputformat")) {
setIsJavaRecordReader(job, true);
job.setInputFormat(getClass(results, "inputformat", job,
InputFormat.class));
}
if (results.hasOption("javareader")) {
setIsJavaRecordReader(job, true);
}
if (results.hasOption("map")) {
setIsJavaMapper(job, true);
job.setMapperClass(getClass(results, "map", job, Mapper.class));
}
if (results.hasOption("partitioner")) {
job.setPartitionerClass(getClass(results, "partitioner", job,
Partitioner.class));
}
if (results.hasOption("reduce")) {
setIsJavaReducer(job, true);
job.setReducerClass(getClass(results, "reduce", job, Reducer.class));
}
if (results.hasOption("reduces")) {
job.setNumReduceTasks(Integer.parseInt((String)
results.getOptionValue("reduces")));
}
if (results.hasOption("writer")) {
setIsJavaRecordWriter(job, true);
job.setOutputFormat(getClass(results, "writer", job,
OutputFormat.class));
}
if (results.hasOption("program")) {
setExecutable(job, (String) results.getOptionValue("program"));
}
if (results.hasOption("jobconf")) {
LOG.warn("-jobconf option is deprecated, please use -D instead.");
String options = (String)results.getOptionValue("jobconf");
StringTokenizer tokenizer = new StringTokenizer(options, ",");
while (tokenizer.hasMoreTokens()) {
String keyVal = tokenizer.nextToken().trim();
String[] keyValSplit = keyVal.split("=", 2);
job.set(keyValSplit[0], keyValSplit[1]);
}
}
// if they gave us a jar file, include it into the class path
String jarFile = job.getJar();
if (jarFile != null) {
final URL[] urls = new URL[]{ FileSystem.getLocal(job).
pathToFile(new Path(jarFile)).toURL()};
//FindBugs complains that creating a URLClassLoader should be
//in a doPrivileged() block.
ClassLoader loader =
AccessController.doPrivileged(
new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
return new URLClassLoader(urls);
}
}
);
job.setClassLoader(loader);
}
runJob(job);
return 0;
} catch (ParseException pe) {
LOG.info("Error : " + pe);
cli.printUsage();
return 1;
}
}
/**
* Submit a pipes job based on the command line arguments.
* @param args
*/
public static void main(String[] args) throws Exception {
int exitCode = new Submitter().run(args);
System.exit(exitCode);
}
}