tech.mlsql.ets.hdfs

Class WowFsShell

java.lang.Object

org.apache.hadoop.conf.Configured

tech.mlsql.ets.hdfs.WowFsShell

All Implemented Interfaces:

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

public class WowFsShell
extends org.apache.hadoop.conf.Configured
implements org.apache.hadoop.util.Tool

2019-05-07 WilliamZhu(allwefantasy@gmail.com)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	WowFsShell.Help Displays short usage of commands sans the long description
protected class	WowFsShell.Usage Display help for commands with their short usage and long description

Field Summary

Fields

Modifier and Type	Field and Description
protected String	basePath
protected org.apache.hadoop.fs.shell.CommandFactory	commandFactory
PrintStream	error
PrintStream	out

Constructor Summary

Constructors

Constructor and Description
WowFsShell() Default ctor with no configuration.
WowFsShell(org.apache.hadoop.conf.Configuration conf, String basePath) Construct a FsShell with the given configuration.

Method Summary

Modifier and Type	Method and Description
String	_out(ByteArrayOutputStream wow)
void	close() Performs any necessary cleanup
String	getError()
protected org.apache.hadoop.fs.FileSystem	getFS()
String	getOut()
protected void	init()
int	run(String[] argv) run

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Field Detail

basePath

protected String basePath

commandFactory

protected org.apache.hadoop.fs.shell.CommandFactory commandFactory

out

public final PrintStream out

error

public final PrintStream error

Constructor Detail

WowFsShell

public WowFsShell()

Default ctor with no configuration. Be sure to invoke Configured.setConf(Configuration) with a valid configuration prior to running commands.

WowFsShell

public WowFsShell(org.apache.hadoop.conf.Configuration conf,
                  String basePath)

Construct a FsShell with the given configuration. Commands can be executed via run(String[])

Parameters:

conf - the hadoop configuration

Method Detail

getOut

public String getOut()

_out

public String _out(ByteArrayOutputStream wow)

getError

public String getError()

getFS

protected org.apache.hadoop.fs.FileSystem getFS()
                                         throws IOException

Throws:

IOException

init

protected void init()
             throws IOException

Throws:

IOException

run

public int run(String[] argv)
        throws Exception

run

Specified by:

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

Throws:

Exception

close

public void close()
           throws IOException

Performs any necessary cleanup

Throws:

IOException - upon error