org.apache.hadoop.fs

类 DF

java.lang.Object

org.apache.hadoop.util.Shell

org.apache.hadoop.fs.DF

public class DF
extends Shell

Filesystem disk space usage statistics. Uses the unix 'df' program to get mount points, and java.io.File for space utilization. Tested on Linux, FreeBSD, Cygwin.

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.util.Shell

Shell.ExitCodeException, Shell.ShellCommandExecutor

字段概要

字段

限定符和类型	字段和说明
static long	DF_INTERVAL_DEFAULT Default DF refresh interval.

从类继承的字段 org.apache.hadoop.util.Shell

LOG, SET_GROUP_COMMAND, SET_OWNER_COMMAND, SET_PERMISSION_COMMAND, timeOutInterval, ULIMIT_COMMAND, USER_NAME_COMMAND, WINDOWS

构造器概要

构造器

构造器和说明
DF(File path, Configuration conf)
DF(File path, long dfInterval)

方法概要

方法

限定符和类型	方法和说明
long	getAvailable()
long	getCapacity()
String	getDirPath()
protected String[]	getExecString() return an array containing the command name & its parameters
String	getFilesystem()
String	getMount()
int	getPercentUsed()
long	getUsed()
static void	main(String[] args)
protected void	parseExecResult(BufferedReader lines) Parse the execution result
String	toString()

从类继承的方法 org.apache.hadoop.util.Shell

execCommand, execCommand, execCommand, getExitCode, getGET_PERMISSION_COMMAND, getGroupsCommand, getGroupsForUserCommand, getProcess, getUlimitMemoryCommand, getUlimitMemoryCommand, getUsersForNetgroupCommand, isTimedOut, run, setEnvironment, setWorkingDirectory

从类继承的方法 java.lang.Object

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

字段详细资料

DF_INTERVAL_DEFAULT

public static final long DF_INTERVAL_DEFAULT

Default DF refresh interval.

另请参阅:

常量字段值

构造器详细资料

DF

public DF(File path,
  Configuration conf)
   throws IOException

抛出:

IOException

DF

public DF(File path,
  long dfInterval)
   throws IOException

抛出:

IOException

方法详细资料

getDirPath

public String getDirPath()

返回:

the canonical path to the volume we're checking.

getFilesystem

public String getFilesystem()
                     throws IOException

返回:

a string indicating which filesystem volume we're checking.

抛出:

IOException

getCapacity

public long getCapacity()

返回:

the capacity of the measured filesystem in bytes.

getUsed

public long getUsed()

返回:

the total used space on the filesystem in bytes.

getAvailable

public long getAvailable()

返回:

the usable space remaining on the filesystem in bytes.

getPercentUsed

public int getPercentUsed()

返回:

the amount of the volume full, as a percent.

getMount

public String getMount()
                throws IOException

返回:

the filesystem mount point for the indicated volume

抛出:

IOException

toString

public String toString()

覆盖:

toString 在类中 Object

getExecString

protected String[] getExecString()

从类复制的说明: Shell

return an array containing the command name & its parameters

指定者:

getExecString 在类中 Shell

parseExecResult

protected void parseExecResult(BufferedReader lines)
                        throws IOException

从类复制的说明: Shell

Parse the execution result

指定者:

parseExecResult 在类中 Shell

抛出:

IOException

main

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

抛出:

Exception