org.apache.hadoop.tools

Class DistCpV1

java.lang.Object

org.apache.hadoop.tools.DistCpV1

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public class DistCpV1
extends Object
implements org.apache.hadoop.util.Tool

A Map-reduce program to recursively copy directories between different file-systems.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DistCpV1.DuplicationException An exception class for duplicated source files.

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.commons.logging.Log	LOG

Constructor Summary

Constructors

Constructor and Description
DistCpV1(org.apache.hadoop.conf.Configuration conf)

Method Summary

Methods

Modifier and Type	Method and Description
static void	copy(org.apache.hadoop.conf.Configuration conf, String srcPath, String destPath, org.apache.hadoop.fs.Path logPath, boolean srcAsList, boolean ignoreReadFailures) Deprecated.
org.apache.hadoop.conf.Configuration	getConf()
static String	getRandomId()
static void	main(String[] args)
int	run(String[] args) This is the main driver for recursively copying directories across file systems.
void	setConf(org.apache.hadoop.conf.Configuration conf)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

Constructor Detail

DistCpV1

public DistCpV1(org.apache.hadoop.conf.Configuration conf)

Method Detail

setConf

public void setConf(org.apache.hadoop.conf.Configuration conf)

Specified by:

setConf in interface org.apache.hadoop.conf.Configurable

getConf

public org.apache.hadoop.conf.Configuration getConf()

Specified by:

getConf in interface org.apache.hadoop.conf.Configurable

copy

@Deprecated
public static void copy(org.apache.hadoop.conf.Configuration conf,
                   String srcPath,
                   String destPath,
                   org.apache.hadoop.fs.Path logPath,
                   boolean srcAsList,
                   boolean ignoreReadFailures)
                 throws IOException

Deprecated.

Throws:

IOException

run

public int run(String[] args)

This is the main driver for recursively copying directories across file systems. It takes at least two cmdline parameters. A source URL and a destination URL. It then essentially does an "ls -lR" on the source URL, and writes the output in a round-robin manner to all the map input files. The mapper actually copies the files allotted to it. The reduce is empty.

Specified by:

run in interface org.apache.hadoop.util.Tool

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

getRandomId

public static String getRandomId()