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Posted to common-commits@hadoop.apache.org by ac...@apache.org on 2008/09/18 05:02:51 UTC
svn commit: r696551 [2/3] - in /hadoop/core/trunk: ./ docs/
src/contrib/streaming/src/java/org/apache/hadoop/streaming/
src/core/org/apache/hadoop/util/ src/docs/src/documentation/content/xdocs/
src/mapred/org/apache/hadoop/mapred/pipes/
Modified: hadoop/core/trunk/docs/streaming.pdf
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/streaming.pdf?rev=696551&r1=696550&r2=696551&view=diff
==============================================================================
--- hadoop/core/trunk/docs/streaming.pdf (original)
+++ hadoop/core/trunk/docs/streaming.pdf Wed Sep 17 20:02:51 2008
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%%EOF
Modified: hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/HadoopStreaming.java
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/HadoopStreaming.java?rev=696551&r1=696550&r2=696551&view=diff
==============================================================================
--- hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/HadoopStreaming.java (original)
+++ hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/HadoopStreaming.java Wed Sep 17 20:02:51 2008
@@ -18,7 +18,7 @@
package org.apache.hadoop.streaming;
-import java.io.IOException;
+import org.apache.hadoop.util.ToolRunner;
/** The main entrypoint. Usually invoked with the script bin/hadoopStreaming
* or bin/hadoop har hadoop-streaming.jar args.
@@ -26,11 +26,10 @@
*/
public class HadoopStreaming {
- public static void main(String[] args) throws IOException {
- boolean mayExit = true;
+ public static void main(String[] args) throws Exception {
int returnStatus = 0;
- StreamJob job = new StreamJob(args, mayExit);
- returnStatus = job.go();
+ StreamJob job = new StreamJob();
+ returnStatus = ToolRunner.run(job, args);
if (returnStatus != 0) {
System.err.println("Streaming Job Failed!");
System.exit(returnStatus);
Modified: hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/StreamJob.java
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/StreamJob.java?rev=696551&r1=696550&r2=696551&view=diff
==============================================================================
--- hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/StreamJob.java (original)
+++ hadoop/core/trunk/src/contrib/streaming/src/java/org/apache/hadoop/streaming/StreamJob.java Wed Sep 17 20:02:51 2008
@@ -68,12 +68,14 @@
import org.apache.hadoop.mapred.TextOutputFormat;
import org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorCombiner;
import org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorReducer;
+import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.StringUtils;
+import org.apache.hadoop.util.Tool;
/** All the client-side work happens here.
* (Jar packaging, MapRed job submission and monitoring)
*/
-public class StreamJob {
+public class StreamJob implements Tool {
protected static final Log LOG = LogFactory.getLog(StreamJob.class.getName());
final static String REDUCE_NONE = "NONE";
@@ -91,11 +93,47 @@
"-jobconf", "(n=v) Optional. Add or override a JobConf property.", 'D');
private MultiPropertyOption cmdenv = new MultiPropertyOption(
"-cmdenv", "(n=v) Pass env.var to streaming commands.", 'E');
-
+ /**@deprecated use StreamJob() with ToolRunner or set the
+ * Configuration using {@link #setConf(Configuration)} and
+ * run with {@link #run(String[])}.
+ */
+ @Deprecated
public StreamJob(String[] argv, boolean mayExit) {
- setupOptions();
+ this();
argv_ = argv;
- mayExit_ = mayExit;
+ this.config_ = new Configuration();
+ }
+
+ public StreamJob() {
+ setupOptions();
+ }
+
+ @Override
+ public Configuration getConf() {
+ return config_;
+ }
+
+ @Override
+ public void setConf(Configuration conf) {
+ this.config_ = conf;
+ }
+
+ @Override
+ public int run(String[] args) throws Exception {
+ try {
+ this.argv_ = args;
+ init();
+
+ preProcessArgs();
+ parseArgv();
+ postProcessArgs();
+
+ setJobConf();
+ return submitAndMonitorJob();
+ }catch (IllegalArgumentException ex) {
+ //ignore, since log will already be printed
+ return 1;
+ }
}
/**
@@ -103,16 +141,16 @@
* intializes the job conf and submits the job
* to the jobtracker
* @throws IOException
+ * @deprecated use {@link #run(String[])} instead.
*/
+ @Deprecated
public int go() throws IOException {
- init();
-
- preProcessArgs();
- parseArgv();
- postProcessArgs();
-
- setJobConf();
- return submitAndMonitorJob();
+ try {
+ return run(argv_);
+ }
+ catch (Exception ex) {
+ throw new IOException(ex.getMessage());
+ }
}
protected void init() {
@@ -129,11 +167,7 @@
}
void postProcessArgs() throws IOException {
- if (cluster_ == null) {
- // hadoop-default.xml is standard, hadoop-local.xml is not.
- cluster_ = "default";
- }
- hadoopAliasConf_ = "hadoop-" + getClusterNick() + ".xml";
+
if (inputSpecs_.size() == 0) {
fail("Required argument: -input <name>");
}
@@ -193,21 +227,13 @@
return cmd;
}
- String getHadoopAliasConfFile() {
- return new File(getHadoopClientHome() + "/conf", hadoopAliasConf_).getAbsolutePath();
- }
-
void parseArgv(){
CommandLine cmdLine = null;
try{
cmdLine = parser.parse(argv_);
}catch(Exception oe){
LOG.error(oe.getMessage());
- if (detailedUsage_) {
- exitUsage(true);
- } else {
- exitUsage(false);
- }
+ exitUsage(argv_.length > 0 && "-info".equals(argv_[0]));
}
if (cmdLine != null){
@@ -222,20 +248,14 @@
comCmd_ = (String)cmdLine.getValue("-combiner");
redCmd_ = (String)cmdLine.getValue("-reducer");
- packageFiles_.addAll(cmdLine.getValues("-file"));
-
- cluster_ = (String)cmdLine.getValue("-cluster");
-
- configPath_.addAll(cmdLine.getValues("-config"));
-
+ if(!cmdLine.getValues("-file").isEmpty()) {
+ packageFiles_.addAll(cmdLine.getValues("-file"));
+ }
+
String fsName = (String)cmdLine.getValue("-dfs");
if (null != fsName){
- userJobConfProps_.put("fs.default.name", fsName);
- }
-
- String jt = (String)cmdLine.getValue("mapred.job.tracker");
- if (null != jt){
- userJobConfProps_.put("fs.default.name", jt);
+ LOG.warn("-dfs option is deprecated, please use -fs instead.");
+ config_.set("fs.default.name", fsName);
}
additionalConfSpec_ = (String)cmdLine.getValue("-additionalconfspec");
@@ -248,14 +268,16 @@
reduceDebugSpec_ = (String)cmdLine.getValue("-reducedebug");
List<String> car = cmdLine.getValues("-cacheArchive");
- if (null != car){
+ if (null != car && !car.isEmpty()){
+ LOG.warn("-cacheArchive option is deprecated, please use -archives instead.");
for(String s : car){
cacheArchives = (cacheArchives == null)?s :cacheArchives + "," + s;
}
}
List<String> caf = cmdLine.getValues("-cacheFile");
- if (null != caf){
+ if (null != caf && !caf.isEmpty()){
+ LOG.warn("-cacheFile option is deprecated, please use -files instead.");
for(String s : caf){
cacheFiles = (cacheFiles == null)?s :cacheFiles + "," + s;
}
@@ -264,10 +286,11 @@
List<String> jobConfArgs = (List<String>)cmdLine.getValue(jobconf);
List<String> envArgs = (List<String>)cmdLine.getValue(cmdenv);
- if (null != jobConfArgs){
+ if (null != jobConfArgs && !jobConfArgs.isEmpty()){
+ LOG.warn("-jobconf option is deprecated, please use -D instead.");
for(String s : jobConfArgs){
String []parts = s.split("=", 2);
- userJobConfProps_.put(parts[0], parts[1]);
+ config_.set(parts[0], parts[1]);
}
}
if (null != envArgs){
@@ -278,8 +301,8 @@
addTaskEnvironment_ += s;
}
}
- }else if (detailedUsage_) {
- exitUsage(true);
+ }else {
+ exitUsage(argv_.length > 0 && "-info".equals(argv_[0]));
}
}
@@ -454,38 +477,37 @@
public void exitUsage(boolean detailed) {
// 1 2 3 4 5 6 7
//1234567890123456789012345678901234567890123456789012345678901234567890123456789
+
+ System.out.println("Usage: $HADOOP_HOME/bin/hadoop jar \\");
+ System.out.println(" $HADOOP_HOME/hadoop-streaming.jar [options]");
+ System.out.println("Options:");
+ System.out.println(" -input <path> DFS input file(s) for the Map step");
+ System.out.println(" -output <path> DFS output directory for the Reduce step");
+ System.out.println(" -mapper <cmd|JavaClassName> The streaming command to run");
+ System.out.println(" -combiner <JavaClassName> Combiner has to be a Java class");
+ System.out.println(" -reducer <cmd|JavaClassName> The streaming command to run");
+ System.out.println(" -file <file> File/dir to be shipped in the Job jar file");
+ System.out.println(" -inputformat TextInputFormat(default)|SequenceFileAsTextInputFormat|JavaClassName Optional.");
+ System.out.println(" -outputformat TextOutputFormat(default)|JavaClassName Optional.");
+ System.out.println(" -partitioner JavaClassName Optional.");
+ System.out.println(" -numReduceTasks <num> Optional.");
+ System.out.println(" -inputreader <spec> Optional.");
+ System.out.println(" -cmdenv <n>=<v> Optional. Pass env.var to streaming commands");
+ System.out.println(" -mapdebug <path> Optional. " +
+ "To run this script when a map task fails ");
+ System.out.println(" -reducedebug <path> Optional." +
+ " To run this script when a reduce task fails ");
+ System.out.println(" -verbose");
+ System.out.println();
+ GenericOptionsParser.printGenericCommandUsage(System.out);
+
if (!detailed) {
- System.out.println("Usage: $HADOOP_HOME/bin/hadoop [--config dir] jar \\");
- System.out.println(" $HADOOP_HOME/hadoop-streaming.jar [options]");
- System.out.println("Options:");
- System.out.println(" -input <path> DFS input file(s) for the Map step");
- System.out.println(" -output <path> DFS output directory for the Reduce step");
- System.out.println(" -mapper <cmd|JavaClassName> The streaming command to run");
- System.out.println(" -combiner <JavaClassName> Combiner has to be a Java class");
- System.out.println(" -reducer <cmd|JavaClassName> The streaming command to run");
- System.out.println(" -file <file> File/dir to be shipped in the Job jar file");
- System.out.println(" -dfs <h:p>|local Optional. Override DFS configuration");
- System.out.println(" -jt <h:p>|local Optional. Override JobTracker configuration");
- System.out.println(" -additionalconfspec specfile Optional.");
- System.out.println(" -inputformat TextInputFormat(default)|SequenceFileAsTextInputFormat|JavaClassName Optional.");
- System.out.println(" -outputformat TextOutputFormat(default)|JavaClassName Optional.");
- System.out.println(" -partitioner JavaClassName Optional.");
- System.out.println(" -numReduceTasks <num> Optional.");
- System.out.println(" -inputreader <spec> Optional.");
- System.out.println(" -jobconf <n>=<v> Optional. Add or override a JobConf property");
- System.out.println(" -cmdenv <n>=<v> Optional. Pass env.var to streaming commands");
- System.out.println(" -mapdebug <path> Optional. " +
- "To run this script when a map task fails ");
- System.out.println(" -reducedebug <path> Optional." +
- " To run this script when a reduce task fails ");
- System.out.println(" -cacheFile fileNameURI");
- System.out.println(" -cacheArchive fileNameURI");
- System.out.println(" -verbose");
System.out.println();
System.out.println("For more details about these options:");
System.out.println("Use $HADOOP_HOME/bin/hadoop jar build/hadoop-streaming.jar -info");
fail("");
}
+ System.out.println();
System.out.println("In -input: globbing on <path> is supported and can have multiple -input");
System.out.println("Default Map input format: a line is a record in UTF-8");
System.out.println(" the key part ends at first TAB, the rest of the line is the value");
@@ -498,7 +520,7 @@
System.out.println(" The location of this working directory is unspecified.");
System.out.println();
System.out.println("To set the number of reduce tasks (num. of output files):");
- System.out.println(" -jobconf mapred.reduce.tasks=10");
+ System.out.println(" -D mapred.reduce.tasks=10");
System.out.println("To skip the sort/combine/shuffle/sort/reduce step:");
System.out.println(" Use -numReduceTasks 0");
System.out
@@ -509,24 +531,24 @@
System.out.println(" This equivalent -reducer NONE");
System.out.println();
System.out.println("To speed up the last maps:");
- System.out.println(" -jobconf mapred.map.tasks.speculative.execution=true");
+ System.out.println(" -D mapred.map.tasks.speculative.execution=true");
System.out.println("To speed up the last reduces:");
- System.out.println(" -jobconf mapred.reduce.tasks.speculative.execution=true");
+ System.out.println(" -D mapred.reduce.tasks.speculative.execution=true");
System.out.println("To name the job (appears in the JobTracker Web UI):");
- System.out.println(" -jobconf mapred.job.name='My Job' ");
+ System.out.println(" -D mapred.job.name='My Job' ");
System.out.println("To change the local temp directory:");
- System.out.println(" -jobconf dfs.data.dir=/tmp/dfs");
- System.out.println(" -jobconf stream.tmpdir=/tmp/streaming");
+ System.out.println(" -D dfs.data.dir=/tmp/dfs");
+ System.out.println(" -D stream.tmpdir=/tmp/streaming");
System.out.println("Additional local temp directories with -cluster local:");
- System.out.println(" -jobconf mapred.local.dir=/tmp/local");
- System.out.println(" -jobconf mapred.system.dir=/tmp/system");
- System.out.println(" -jobconf mapred.temp.dir=/tmp/temp");
+ System.out.println(" -D mapred.local.dir=/tmp/local");
+ System.out.println(" -D mapred.system.dir=/tmp/system");
+ System.out.println(" -D mapred.temp.dir=/tmp/temp");
System.out.println("To treat tasks with non-zero exit status as SUCCEDED:");
- System.out.println(" -jobconf stream.non.zero.exit.is.failure=false");
+ System.out.println(" -D stream.non.zero.exit.is.failure=false");
System.out.println("Use a custom hadoopStreaming build along a standard hadoop install:");
System.out.println(" $HADOOP_HOME/bin/hadoop jar /path/my-hadoop-streaming.jar [...]\\");
System.out
- .println(" [...] -jobconf stream.shipped.hadoopstreaming=/path/my-hadoop-streaming.jar");
+ .println(" [...] -D stream.shipped.hadoopstreaming=/path/my-hadoop-streaming.jar");
System.out.println("For more details about jobconf parameters see:");
System.out.println(" http://wiki.apache.org/hadoop/JobConfFile");
System.out.println("To set an environement variable in a streaming command:");
@@ -544,13 +566,9 @@
fail("");
}
- public void fail(String message) {
- if (mayExit_) {
- System.err.println(message);
- throw new RuntimeException(message);
- } else {
- throw new IllegalArgumentException(message);
- }
+ public void fail(String message) {
+ System.err.println(message);
+ throw new IllegalArgumentException(message);
}
// --------------------------------------------
@@ -565,17 +583,12 @@
}
protected boolean isLocalHadoop() {
- boolean local;
- if (jobConf_ == null) {
- local = getClusterNick().equals("local");
- } else {
- local = StreamUtil.isLocalJobTracker(jobConf_);
- }
- return local;
+ return StreamUtil.isLocalJobTracker(jobConf_);
}
+ @Deprecated
protected String getClusterNick() {
- return cluster_;
+ return "default";
}
/** @return path to the created Jar file or null if no files are necessary.
@@ -589,8 +602,7 @@
// First try an explicit spec: it's too hard to find our own location in this case:
// $HADOOP_HOME/bin/hadoop jar /not/first/on/classpath/custom-hadoop-streaming.jar
// where findInClasspath() would find the version of hadoop-streaming.jar in $HADOOP_HOME
- String runtimeClasses = userJobConfProps_.get("stream.shipped.hadoopstreaming"); // jar or class dir
- System.out.println(runtimeClasses + "=@@@userJobConfProps_.get(stream.shipped.hadoopstreaming");
+ String runtimeClasses = config_.get("stream.shipped.hadoopstreaming"); // jar or class dir
if (runtimeClasses == null) {
runtimeClasses = StreamUtil.findInClasspath(StreamJob.class.getName());
@@ -632,25 +644,6 @@
builder.merge(packageFiles_, unjarFiles, jobJarName);
return jobJarName;
}
-
- /**
- * This method sets the user jobconf variable specified
- * by user using -jobconf key=value
- * @param doEarlyProps
- */
- protected void setUserJobConfProps(boolean doEarlyProps) {
- Iterator it = userJobConfProps_.keySet().iterator();
- while (it.hasNext()) {
- String key = (String) it.next();
- String val = userJobConfProps_.get(key);
- boolean earlyName = key.equals("fs.default.name");
- earlyName |= key.equals("stream.shipped.hadoopstreaming");
- if (doEarlyProps == earlyName) {
- msg("xxxJobConf: set(" + key + ", " + val + ") early=" + doEarlyProps);
- jobConf_.set(key, val);
- }
- }
- }
/**
* get the uris of all the files/caches
@@ -663,22 +656,10 @@
}
protected void setJobConf() throws IOException {
- msg("hadoopAliasConf_ = " + hadoopAliasConf_);
- config_ = new Configuration();
- if (!cluster_.equals("default")) {
- config_.addResource(new Path(getHadoopAliasConfFile()));
- } else {
- // use only defaults: hadoop-default.xml and hadoop-site.xml
- }
- System.out.println("additionalConfSpec_:" + additionalConfSpec_);
if (additionalConfSpec_ != null) {
+ LOG.warn("-additionalconfspec option is deprecated, please use -conf instead.");
config_.addResource(new Path(additionalConfSpec_));
}
- Iterator it = configPath_.iterator();
- while (it.hasNext()) {
- String pathName = (String) it.next();
- config_.addResource(new Path(pathName));
- }
// general MapRed job properties
jobConf_ = new JobConf(config_);
@@ -686,8 +667,6 @@
// All streaming jobs get the task timeout value
// from the configuration settings.
- setUserJobConfProps(true);
-
// The correct FS must be set before this is called!
// (to resolve local vs. dfs drive letter differences)
// (mapred.working.dir will be lazily initialized ONCE and depends on FS)
@@ -802,7 +781,6 @@
}
}
- setUserJobConfProps(false);
FileOutputFormat.setOutputPath(jobConf_, new Path(output_));
fmt = null;
if (outputFormatSpec_!= null) {
@@ -1027,7 +1005,6 @@
}
}
- protected boolean mayExit_;
protected String[] argv_;
protected boolean verbose_;
protected boolean detailedUsage_;
@@ -1047,18 +1024,15 @@
protected boolean hasSimpleInputSpecs_;
protected ArrayList packageFiles_ = new ArrayList(); // <String>
protected ArrayList shippedCanonFiles_ = new ArrayList(); // <String>
- protected TreeMap<String, String> userJobConfProps_ = new TreeMap<String, String>();
+ //protected TreeMap<String, String> userJobConfProps_ = new TreeMap<String, String>();
protected String output_;
protected String mapCmd_;
protected String comCmd_;
protected String redCmd_;
- protected String cluster_;
protected String cacheFiles;
protected String cacheArchives;
protected URI[] fileURIs;
protected URI[] archiveURIs;
- protected ArrayList configPath_ = new ArrayList(); // <String>
- protected String hadoopAliasConf_;
protected String inReaderSpec_;
protected String inputFormatSpec_;
protected String outputFormatSpec_;
@@ -1079,4 +1053,5 @@
protected JobID jobId_;
protected static String LINK_URI = "You need to specify the uris as hdfs://host:port/#linkname," +
"Please specify a different link name for all of your caching URIs";
+
}
Modified: hadoop/core/trunk/src/core/org/apache/hadoop/util/GenericOptionsParser.java
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/src/core/org/apache/hadoop/util/GenericOptionsParser.java?rev=696551&r1=696550&r2=696551&view=diff
==============================================================================
--- hadoop/core/trunk/src/core/org/apache/hadoop/util/GenericOptionsParser.java (original)
+++ hadoop/core/trunk/src/core/org/apache/hadoop/util/GenericOptionsParser.java Wed Sep 17 20:02:51 2008
@@ -35,8 +35,8 @@
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
/**
* <code>GenericOptionsParser</code> is a utility to parse command line
@@ -165,7 +165,7 @@
* Specify properties of each generic option
*/
@SuppressWarnings("static-access")
- private Options buildGeneralOptions(Options opts) {
+ private static Options buildGeneralOptions(Options opts) {
Option fs = OptionBuilder.withArgName("local|namenode:port")
.hasArg()
.withDescription("specify a namenode")
@@ -224,7 +224,10 @@
conf.set("mapred.job.tracker", line.getOptionValue("jt"));
}
if (line.hasOption("conf")) {
- conf.addResource(new Path(line.getOptionValue("conf")));
+ String[] values = line.getOptionValues("conf");
+ for(String value : values) {
+ conf.addResource(new Path(value));
+ }
}
try {
if (line.hasOption("libjars")) {
@@ -356,6 +359,7 @@
* @param out stream to print the usage message to.
*/
public static void printGenericCommandUsage(PrintStream out) {
+
out.println("Generic options supported are");
out.println("-conf <configuration file> specify an application configuration file");
out.println("-D <property=value> use value for given property");
Modified: hadoop/core/trunk/src/docs/src/documentation/content/xdocs/streaming.xml
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/src/docs/src/documentation/content/xdocs/streaming.xml?rev=696551&r1=696550&r2=696551&view=diff
==============================================================================
--- hadoop/core/trunk/src/docs/src/documentation/content/xdocs/streaming.xml (original)
+++ hadoop/core/trunk/src/docs/src/documentation/content/xdocs/streaming.xml Wed Sep 17 20:02:51 2008
@@ -111,7 +111,7 @@
<p>
Often, you may want to process input data using a map function only. To do this, simply set mapred.reduce.tasks to zero. The Map/Reduce framework will not create any reducer tasks. Rather, the outputs of the mapper tasks will be the final output of the job.
</p><p>
-To be backward compatible, Hadoop Streaming also supports the "-reduce NONE" option, which is equivalent to "-jobconf mapred.reduce.tasks=0".
+To be backward compatible, Hadoop Streaming also supports the "-reduce NONE" option, which is equivalent to "-D mapred.reduce.tasks=0".
</p>
</section>
@@ -137,31 +137,31 @@
<title>Large files and archives in Hadoop Streaming </title>
<p>
-The -cacheFile and -cacheArchive options allow you to make files and archives available to the tasks. The argument is a URI to the file or archive that you have already uploaded to HDFS. These files and archives are cached across jobs. You can retrieve the host and fs_port values from the fs.default.name config variable.
+The -files and -archives options allow you to make files and archives available to the tasks. The argument is a URI to the file or archive that you have already uploaded to HDFS. These files and archives are cached across jobs. You can retrieve the host and fs_port values from the fs.default.name config variable.
</p>
<p>
-Here are examples of the -cacheFile option:
+Here are examples of the -files option:
</p>
<source>
--cacheFile hdfs://host:fs_port/user/testfile.txt#testlink
+-files hdfs://host:fs_port/user/testfile.txt#testlink
</source>
<p>
In the above example, the part of the url after # is used as the symlink name that is created in the current working directory of tasks. So the tasks will have a symlink called testlink in the cwd that points to a local copy of testfile.txt. Multiple entries can be specified as:
</p>
<source>
--cacheFile hdfs://host:fs_port/user/testfile1.txt#testlink1 -cacheFile hdfs://host:fs_port/user/testfile2.txt#testlink2
+-files hdfs://host:fs_port/user/testfile1.txt#testlink1 -files hdfs://host:fs_port/user/testfile2.txt#testlink2
</source>
<p>
-The -cacheArchive option allows you to copy jars locally to the cwd of tasks and automatically unjar the files. For example:
+The -archives option allows you to copy jars locally to the cwd of tasks and automatically unjar the files. For example:
</p>
<source>
--cacheArchive hdfs://host:fs_port/user/testfile.jar#testlink3
+-archives hdfs://host:fs_port/user/testfile.jar#testlink3
</source>
<p>
In the example above, a symlink testlink3 is created in the current working directory of tasks. This symlink points to the directory that stores the unjarred contents of the uploaded jar file.
</p>
<p>
-Here's another example of the -cacheArchive option. Here, the input.txt file has two lines specifying the names of the two files: testlink/cache.txt and testlink/cache2.txt. "testlink" is a symlink to the archived directory, which has the files "cache.txt" and "cache2.txt".
+Here's another example of the -archives option. Here, the input.txt file has two lines specifying the names of the two files: testlink/cache.txt and testlink/cache2.txt. "testlink" is a symlink to the archived directory, which has the files "cache.txt" and "cache2.txt".
</p>
<source>
$HADOOP_HOME/bin/hadoop jar $HADOOP_HOME/hadoop-streaming.jar \
@@ -169,10 +169,10 @@
-mapper "xargs cat" \
-reducer "cat" \
-output "/user/me/samples/cachefile/out" \
- -cacheArchive 'hdfs://hadoop-nn1.example.com/user/me/samples/cachefile/cachedir.jar#testlink' \
- -jobconf mapred.map.tasks=1 \
- -jobconf mapred.reduce.tasks=1 \
- -jobconf mapred.job.name="Experiment"
+ -archives 'hdfs://hadoop-nn1.example.com/user/me/samples/cachefile/cachedir.jar#testlink' \
+ -D mapred.map.tasks=1 \
+ -D mapred.reduce.tasks=1 \
+ -D mapred.job.name="Experiment"
$ ls test_jar/
cache.txt cache2.txt
@@ -208,7 +208,7 @@
<section>
<title>Specifying Additional Configuration Variables for Jobs </title>
<p>
-You can specify additional configuration variables by using "-jobconf <n>=<v>". For example:
+You can specify additional configuration variables by using "-D <n>=<v>". For example:
</p>
<source>
$HADOOP_HOME/bin/hadoop jar $HADOOP_HOME/hadoop-streaming.jar \
@@ -216,10 +216,10 @@
-output myOutputDir \
-mapper org.apache.hadoop.mapred.lib.IdentityMapper\
-reducer /bin/wc \
- -jobconf mapred.reduce.tasks=2
+ -D mapred.reduce.tasks=2
</source>
<p>
-The -jobconf mapred.reduce.tasks=2 in the above example specifies to use two reducers for the job.
+The -D mapred.reduce.tasks=2 in the above example specifies to use two reducers for the job.
</p>
<p>
For more details on the jobconf parameters see:
@@ -233,36 +233,46 @@
</p>
<table>
<tr><th>Parameter</th><th>Optional/Required </th><th>Description </th></tr>
-<tr><td> -cluster name </td><td> Optional </td><td> Switch between local Hadoop and one or more remote clusters </td></tr>
-
-<tr><td> -dfs host:port or local </td><td> Optional </td><td> Override the HDFS configuration for the job </td></tr>
-<tr><td> -jt host:port or local </td><td> Optional </td><td> Override the JobTracker configuration for the job </td></tr>
-<tr><td> -additionalconfspec specfile </td><td> Optional </td><td> Specifies a set of configuration variables in an XML file like hadoop-site.xml, instead of using multiple options of type "-jobconf name=value" </td></tr>
<tr><td> -cmdenv name=value </td><td> Optional </td><td> Pass env var to streaming commands </td></tr>
-<tr><td> -cacheFile fileNameURI </td><td> Optional </td><td> Specify a file to be uploaded to the HDFS </td></tr>
-<tr><td> -cacheArchive fileNameURI </td><td> Optional </td><td> Specify a jar file to be uploaded to the HDFS. This jar file is unjarred automatically in the cwd of the task </td></tr>
<tr><td> -inputreader JavaClassName </td><td> Optional </td><td> For backwards-compatibility: specifies a record reader class (instead of an input format class) </td></tr>
<tr><td> -verbose </td><td> Optional </td><td> Verbose output </td></tr>
</table>
<p>
-To switch between "local" Hadoop and one or more remote Hadoop clusters use -cluster <name>.
-By default, hadoop-default.xml and hadoop-site.xml are used. The -cluster <name> option will cause $HADOOP_HOME/conf/hadoop-<name>.xml to be used instead.
+Streaming support Hadoop generic command line options.
+
+Supported parameters are :
+The general command line syntax is :
+<br/> bin/hadoop command [genericOptions] [commandOptions]
</p>
+
+<table>
+<tr><th>Parameter</th><th>Optional/Required </th><th>Description </th></tr>
+
+<tr><td> -conf configuration_file </td><td> Optional </td><td> specify an application configuration file </td></tr>
+<tr><td> -D property=value </td><td> Optional </td><td> use value for given property </td></tr>
+<tr><td> -fs host:port or local </td><td> Optional </td><td> specify a namenode </td></tr>
+<tr><td> -jt host:port or local </td><td> Optional </td><td> specify a job tracker </td></tr>
+<tr><td> -files </td><td> Optional </td><td> specify comma separated files to be copied to the map reduce cluster </td></tr>
+<tr><td> -archives </td><td> Optional </td><td> specify comma separated archives to be unarchived on the compute machines </td></tr>
+<tr><td> </td><td> Optional </td><td> </td></tr>
+<tr><td> -jt host:port or local </td><td> Optional </td><td> </td></tr>
+</table>
+
<p>
To change the local temp directory use:
</p>
<source>
- -jobconf dfs.data.dir=/tmp
+ -D dfs.data.dir=/tmp
</source>
<p>
To specify additional local temp directories use:
</p>
<source>
- -jobconf mapred.local.dir=/tmp/local
- -jobconf mapred.system.dir=/tmp/system
- -jobconf mapred.temp.dir=/tmp/temp
+ -D mapred.local.dir=/tmp/local
+ -D mapred.system.dir=/tmp/system
+ -D mapred.temp.dir=/tmp/temp
</source>
<p>
For more details on jobconf parameters see:
@@ -294,13 +304,13 @@
-output myOutputDir \
-mapper org.apache.hadoop.mapred.lib.IdentityMapper \
-reducer org.apache.hadoop.mapred.lib.IdentityReducer \
- -jobconf stream.map.output.field.separator=. \
- -jobconf stream.num.map.output.key.fields=4
+ -D stream.map.output.field.separator=. \
+ -D stream.num.map.output.key.fields=4
</source>
<p>
-In the above example, "-jobconf stream.map.output.field.separator=." specifies "." as the field separator for the map outputs, and the prefix up to the fourth "." in a line will be the key and the rest of the line (excluding the fourth ".") will be the value. If a line has less than four "."s, then the whole line will be the key and the value will be an empty Text object (like the one created by new Text("")).
+In the above example, "-D stream.map.output.field.separator=." specifies "." as the field separator for the map outputs, and the prefix up to the fourth "." in a line will be the key and the rest of the line (excluding the fourth ".") will be the value. If a line has less than four "."s, then the whole line will be the key and the value will be an empty Text object (like the one created by new Text("")).
</p><p>
-Similarly, you can use "-jobconf stream.reduce.output.field.separator=SEP" and "-jobconf stream.num.reduce.output.fields=NUM" to specify the nth field separator in a line of the reduce outputs as the separator between the key and the value.
+Similarly, you can use "-D stream.reduce.output.field.separator=SEP" and "-D stream.num.reduce.output.fields=NUM" to specify the nth field separator in a line of the reduce outputs as the separator between the key and the value.
</p>
</section>
@@ -317,16 +327,16 @@
-mapper org.apache.hadoop.mapred.lib.IdentityMapper \
-reducer org.apache.hadoop.mapred.lib.IdentityReducer \
-partitioner org.apache.hadoop.mapred.lib.KeyFieldBasedPartitioner \
- -jobconf stream.map.output.field.separator=. \
- -jobconf stream.num.map.output.key.fields=4 \
- -jobconf map.output.key.field.separator=. \
- -jobconf num.key.fields.for.partition=2 \
- -jobconf mapred.reduce.tasks=12
+ -D stream.map.output.field.separator=. \
+ -D stream.num.map.output.key.fields=4 \
+ -D map.output.key.field.separator=. \
+ -D num.key.fields.for.partition=2 \
+ -D mapred.reduce.tasks=12
</source>
<p>
-Here, <em>-jobconf stream.map.output.field.separator=.</em> and <em>-jobconf stream.num.map.output.key.fields=4</em> are as explained in previous example. The two variables are used by streaming to identify the key/value pair of mapper.
+Here, <em>-D stream.map.output.field.separator=.</em> and <em>-D stream.num.map.output.key.fields=4</em> are as explained in previous example. The two variables are used by streaming to identify the key/value pair of mapper.
</p><p>
-The map output keys of the above Map/Reduce job normally have four fields separated by ".". However, the Map/Reduce framework will partition the map outputs by the first two fields of the keys using the <em>-jobconf num.key.fields.for.partition=2</em> option. Here, <em>-jobconf map.output.key.field.separator=.</em> specifies the separator for the partition. This guarantees that all the key/value pairs with the same first two fields in the keys will be partitioned into the same reducer.
+The map output keys of the above Map/Reduce job normally have four fields separated by ".". However, the Map/Reduce framework will partition the map outputs by the first two fields of the keys using the <em>-D num.key.fields.for.partition=2</em> option. Here, <em>-D map.output.key.field.separator=.</em> specifies the separator for the partition. This guarantees that all the key/value pairs with the same first two fields in the keys will be partitioned into the same reducer.
</p><p>
<em>This is effectively equivalent to specifying the first two fields as the primary key and the next two fields as the secondary. The primary key is used for partitioning, and the combination of the primary and secondary keys is used for sorting.</em> A simple illustration is shown here:
</p>
@@ -383,7 +393,7 @@
-mapper myAggregatorForKeyCount.py \
-reducer aggregate \
-file myAggregatorForKeyCount.py \
- -jobconf mapred.reduce.tasks=12
+ -D mapred.reduce.tasks=12
</source>
<p>
The python program myAggregatorForKeyCount.py looks like:
@@ -423,18 +433,18 @@
-mapper org.apache.hadoop.mapred.lib.FieldSelectionMapReduce\
-reducer org.apache.hadoop.mapred.lib.FieldSelectionMapReduce\
-partitioner org.apache.hadoop.mapred.lib.KeyFieldBasedPartitioner \
- -jobconf map.output.key.field.separa=. \
- -jobconf num.key.fields.for.partition=2 \
- -jobconf mapred.data.field.separator=. \
- -jobconf map.output.key.value.fields.spec=6,5,1-3:0- \
- -jobconf reduce.output.key.value.fields.spec=0-2:5- \
- -jobconf mapred.reduce.tasks=12
+ -D map.output.key.field.separa=. \
+ -D num.key.fields.for.partition=2 \
+ -D mapred.data.field.separator=. \
+ -D map.output.key.value.fields.spec=6,5,1-3:0- \
+ -D reduce.output.key.value.fields.spec=0-2:5- \
+ -D mapred.reduce.tasks=12
</source>
<p>
-The option "-jobconf map.output.key.value.fields.spec=6,5,1-3:0-" specifies key/value selection for the map outputs. Key selection spec and value selection spec are separated by ":". In this case, the map output key will consist of fields 6, 5, 1, 2, and 3. The map output value will consist of all fields (0- means field 0 and all
+The option "-D map.output.key.value.fields.spec=6,5,1-3:0-" specifies key/value selection for the map outputs. Key selection spec and value selection spec are separated by ":". In this case, the map output key will consist of fields 6, 5, 1, 2, and 3. The map output value will consist of all fields (0- means field 0 and all
the subsequent fields).
</p><p>
-The option "-jobconf reduce.output.key.value.fields.spec=0-2:0-" specifies key/value selection for the reduce outputs. In this case, the reduce output key will consist of fields 0, 1, 2 (corresponding to the original fields 6, 5, 1). The reduce output value will consist of all fields starting from field 5 (corresponding to all the original fields).
+The option "-D reduce.output.key.value.fields.spec=0-2:0-" specifies key/value selection for the reduce outputs. In this case, the reduce output key will consist of fields 0, 1, 2 (corresponding to the original fields 6, 5, 1). The reduce output value will consist of all fields starting from field 5 (corresponding to all the original fields).
</p>
</section>
</section>
@@ -504,7 +514,7 @@
-input /user/me/samples/student_marks
-mapper \"$c2\" -reducer 'cat'
-output /user/me/samples/student_out
- -jobconf mapred.job.name='Experiment'
+ -D mapred.job.name='Experiment'
$ hadoop dfs -ls samples/student_out
Found 1 items/user/me/samples/student_out/part-00000 <r 3> 16
@@ -530,7 +540,7 @@
The jar packaging happens in a directory pointed to by the configuration variable stream.tmpdir. The default value of stream.tmpdir is /tmp. Set the value to a directory with more space:
</p>
<source>
--jobconf stream.tmpdir=/export/bigspace/...
+-D stream.tmpdir=/export/bigspace/...
</source>
</section>
@@ -546,7 +556,7 @@
<section>
<title>How do I generate output files with gzip format? </title>
<p>
-Instead of plain text files, you can generate gzip files as your generated output. Pass '-jobconf mapred.output.compress=true -jobconf mapred.output.compression.codec=org.apache.hadoop.io.compress.GzipCode' as option to your streaming job.
+Instead of plain text files, you can generate gzip files as your generated output. Pass '-D mapred.output.compress=true -D mapred.output.compression.codec=org.apache.hadoop.io.compress.GzipCode' as option to your streaming job.
</p>
</section>