org.apache.hadoop.tools

类 DistCp

java.lang.Object

org.apache.hadoop.tools.DistCp

所有已实现的接口:

Configurable, Tool

public class DistCp
extends Object
implements Tool

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

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	DistCp.DuplicationException An exception class for duplicated source files.

字段概要

字段

限定符和类型	字段和说明
static org.apache.commons.logging.Log	LOG

构造器概要

构造器

构造器和说明
DistCp(Configuration conf)

方法概要

方法

限定符和类型	方法和说明
static void	copy(Configuration conf, String srcPath, String destPath, Path logPath, boolean srcAsList, boolean ignoreReadFailures) 已过时。
Configuration	getConf() Return the configuration used by this object.
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(Configuration conf) Set the configuration to be used by this object.

从类继承的方法 java.lang.Object

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

字段详细资料

LOG

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

构造器详细资料

DistCp

public DistCp(Configuration conf)

方法详细资料

setConf

public void setConf(Configuration conf)

从接口复制的说明: Configurable

Set the configuration to be used by this object.

指定者:

setConf 在接口中 Configurable

getConf

public Configuration getConf()

从接口复制的说明: Configurable

Return the configuration used by this object.

指定者:

getConf 在接口中 Configurable

copy

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

已过时。

抛出:

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.

指定者:

run 在接口中 Tool

参数:

args - command specific arguments.

返回:

exit code.

main

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

抛出:

Exception

getRandomId

public static String getRandomId()