org.apache.hadoop.tools
Class DistCh

java.lang.Object
  org.apache.hadoop.tools.DistCh

All Implemented Interfaces:

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

public class DistCh
extends Object

A Map-reduce program to recursively change files properties such as owner, group and permission.

Nested Class Summary

static class

DistTool.DuplicationException An exception class for duplicated source files.

Field Summary

protected org.apache.hadoop.mapred.JobConf	jobconf
protected static org.apache.commons.logging.Log	LOG

Method Summary

protected static void	checkSource(org.apache.hadoop.conf.Configuration conf, List<org.apache.hadoop.fs.Path> srcs) Sanity check for source
org.apache.hadoop.mapred.JobConf	getConf()
protected static String	getRandomId()
static void	main(String[] args)
protected static List<String>	readFile(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.Path inputfile)
protected static String	readString(DataInput in)
int	run(String[] args) This is the main driver for recursively changing files properties.
void	setConf(org.apache.hadoop.conf.Configuration conf)
protected static void	writeString(DataOutput out, String s)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

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

jobconf

protected org.apache.hadoop.mapred.JobConf jobconf

Method Detail

run

public int run(String[] args)
        throws Exception

This is the main driver for recursively changing files properties.

Throws:

Exception

main

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

Throws:

Exception

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.mapred.JobConf getConf()

Specified by:

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

getRandomId

protected static String getRandomId()

checkSource

protected static void checkSource(org.apache.hadoop.conf.Configuration conf,
                                  List<org.apache.hadoop.fs.Path> srcs)
                           throws org.apache.hadoop.mapred.InvalidInputException

Sanity check for source

Throws:

org.apache.hadoop.mapred.InvalidInputException

readString

protected static String readString(DataInput in)
                            throws IOException

Throws:

IOException

writeString

protected static void writeString(DataOutput out,
                                  String s)
                           throws IOException

Throws:

IOException

readFile

protected static List<String> readFile(org.apache.hadoop.conf.Configuration conf,
                                       org.apache.hadoop.fs.Path inputfile)
                                throws IOException

Throws:

IOException