org.apache.hadoop.hdfs.tools

类 DFSAdmin

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FsShell

org.apache.hadoop.hdfs.tools.DFSAdmin

所有已实现的接口:

Configurable, Tool

public class DFSAdmin
extends FsShell

This class provides some DFS administrative access.

字段概要

从类继承的字段 org.apache.hadoop.fs.FsShell

dateForm, modifFmt

构造器概要

构造器

构造器和说明
DFSAdmin() Construct a DFSAdmin object.
DFSAdmin(Configuration conf) Construct a DFSAdmin object.

方法概要

方法

限定符和类型	方法和说明
int	finalizeUpgrade() Command to ask the namenode to finalize previously performed upgrade.
protected DistributedFileSystem	getDFS()
static void	main(String[] argv) main() has some simple utility methods.
int	metaSave(String[] argv, int idx) Dumps DFS data structures into specified file.
int	refreshNodes() Command to ask the namenode to reread the hosts and excluded hosts file.
int	refreshServiceAcl() Refresh the authorization policy on the NameNode.
int	refreshSuperUserGroupsConfiguration() refreshSuperUserGroupsConfiguration NameNode.
int	refreshUserToGroupsMappings() Refresh the user-to-groups mappings on the NameNode.
void	report() Gives a report on how the FileSystem is doing.
int	run(String[] argv) run
int	saveNamespace() Command to ask the namenode to save the namespace.
int	setBalancerBandwidth(String[] argv, int idx) Command to ask the namenode to set the balancer bandwidth for all of the datanodes.
void	setSafeMode(String[] argv, int idx) Safe mode maintenance command.
int	upgradeProgress(String[] argv, int idx) Command to request current distributed upgrade status, a detailed status, or to force the upgrade to proceed.

从类继承的方法 org.apache.hadoop.fs.FsShell

byteDesc, close, getCurrentTrashDir, getFS, getTrash, init, limitDecimalTo2

从类继承的方法 org.apache.hadoop.conf.Configured

getConf, setConf

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.conf.Configurable

getConf, setConf

构造器详细资料

DFSAdmin

public DFSAdmin()

Construct a DFSAdmin object.

DFSAdmin

public DFSAdmin(Configuration conf)

Construct a DFSAdmin object.

方法详细资料

getDFS

protected DistributedFileSystem getDFS()
                                throws IOException

抛出:

IOException

report

public void report()
            throws IOException

Gives a report on how the FileSystem is doing.

抛出:

IOException - if the filesystem does not exist.

setSafeMode

public void setSafeMode(String[] argv,
               int idx)
                 throws IOException

Safe mode maintenance command. Usage: java DFSAdmin -safemode [enter | leave | get]

参数:

argv - List of of command line parameters.

idx - The index of the command that is being processed.

抛出:

IOException - if the filesystem does not exist.

saveNamespace

public int saveNamespace()
                  throws IOException

Command to ask the namenode to save the namespace. Usage: java DFSAdmin -saveNamespace

抛出:

IOException

另请参阅:

ClientProtocol.saveNamespace()

refreshNodes

public int refreshNodes()
                 throws IOException

Command to ask the namenode to reread the hosts and excluded hosts file. Usage: java DFSAdmin -refreshNodes

抛出:

IOException

setBalancerBandwidth

public int setBalancerBandwidth(String[] argv,
                       int idx)
                         throws IOException

Command to ask the namenode to set the balancer bandwidth for all of the datanodes. Usage: java DFSAdmin -setBalancerBandwidth bandwidth

参数:

argv - List of of command line parameters.

idx - The index of the command that is being processed.

抛出:

IOException

finalizeUpgrade

public int finalizeUpgrade()
                    throws IOException

Command to ask the namenode to finalize previously performed upgrade. Usage: java DFSAdmin -finalizeUpgrade

抛出:

IOException

upgradeProgress

public int upgradeProgress(String[] argv,
                  int idx)
                    throws IOException

Command to request current distributed upgrade status, a detailed status, or to force the upgrade to proceed. Usage: java DFSAdmin -upgradeProgress [status | details | force]

抛出:

IOException

metaSave

public int metaSave(String[] argv,
           int idx)
             throws IOException

Dumps DFS data structures into specified file. Usage: java DFSAdmin -metasave filename

参数:

argv - List of of command line parameters.

idx - The index of the command that is being processed.

抛出:

IOException - if an error accoured wile accessing the file or path.

refreshServiceAcl

public int refreshServiceAcl()
                      throws IOException

Refresh the authorization policy on the NameNode.

返回:

exitcode 0 on success, non-zero on failure

抛出:

IOException

refreshUserToGroupsMappings

public int refreshUserToGroupsMappings()
                                throws IOException

Refresh the user-to-groups mappings on the NameNode.

返回:

exitcode 0 on success, non-zero on failure

抛出:

IOException

refreshSuperUserGroupsConfiguration

public int refreshSuperUserGroupsConfiguration()
                                        throws IOException

refreshSuperUserGroupsConfiguration NameNode.

返回:

exitcode 0 on success, non-zero on failure

抛出:

IOException

run

public int run(String[] argv)
        throws Exception

从类复制的说明: FsShell

run

指定者:

run 在接口中 Tool

覆盖:

run 在类中 FsShell

参数:

argv - The parameters passed to this program.

返回:

0 on success, non zero on error.

抛出:

Exception - if the filesystem does not exist.

main

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

main() has some simple utility methods.

参数:

argv - Command line parameters.

抛出:

Exception - if the filesystem does not exist.