Package org.apache.hadoop.lib.service.hadoop

Class FileSystemAccessService

java.lang.Object

org.apache.hadoop.lib.server.BaseService

org.apache.hadoop.lib.service.hadoop.FileSystemAccessService

All Implemented Interfaces:

Service, FileSystemAccess

@Private
public class FileSystemAccessService
extends BaseService
implements FileSystemAccess

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.lib.service.FileSystemAccess

FileSystemAccess.FileSystemExecutor<T>

Field Summary

Fields

Modifier and Type	Field	Description
static final String	AUTHENTICATION_TYPE
static final String	FS_CACHE_PURGE_FREQUENCY
static final String	FS_CACHE_PURGE_TIMEOUT
static final String	HADOOP_CONF_DIR
static final String	KERBEROS_KEYTAB
static final String	KERBEROS_PRINCIPAL
static final String	NAME_NODE_WHITELIST
static final String	PREFIX

Constructor Summary

Constructors

Constructor	Description
FileSystemAccessService()

Method Summary

Modifier and Type	Method	Description
protected void	checkNameNodeHealth(org.apache.hadoop.fs.FileSystem fileSystem)
protected void	closeFileSystem(org.apache.hadoop.fs.FileSystem fs)
org.apache.hadoop.fs.FileSystem	createFileSystem(String user, org.apache.hadoop.conf.Configuration conf)
protected org.apache.hadoop.fs.FileSystem	createFileSystem(org.apache.hadoop.conf.Configuration namenodeConf)
org.apache.hadoop.fs.FileSystem	createFileSystemInternal(String user, org.apache.hadoop.conf.Configuration conf)
<T> T	execute(String user, org.apache.hadoop.conf.Configuration conf, FileSystemAccess.FileSystemExecutor<T> executor)
org.apache.hadoop.conf.Configuration	getFileSystemConfiguration()
Class	getInterface()	Returns the interface implemented by this service.
Class[]	getServiceDependencies()	Returns the service dependencies of this service.
protected org.apache.hadoop.security.UserGroupInformation	getUGI(String user)
protected void	init()	Initializes the server.
void	postInit()	Post initializes the service.
void	releaseFileSystem(org.apache.hadoop.fs.FileSystem fs)
protected void	setRequiredServiceHadoopConf(org.apache.hadoop.conf.Configuration conf)
protected void	validateNamenode(String namenode)

Methods inherited from class org.apache.hadoop.lib.server.BaseService

destroy, getPrefix, getPrefixedName, getServer, getServiceConfig, init, serverStatusChange

Methods inherited from class java.lang.Object

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

Field Details

PREFIX

public static final String PREFIX

See Also:

• Constant Field Values

AUTHENTICATION_TYPE

public static final String AUTHENTICATION_TYPE

See Also:

• Constant Field Values

KERBEROS_KEYTAB

public static final String KERBEROS_KEYTAB

See Also:

• Constant Field Values

KERBEROS_PRINCIPAL

public static final String KERBEROS_PRINCIPAL

See Also:

• Constant Field Values

FS_CACHE_PURGE_FREQUENCY

public static final String FS_CACHE_PURGE_FREQUENCY

See Also:

• Constant Field Values

FS_CACHE_PURGE_TIMEOUT

public static final String FS_CACHE_PURGE_TIMEOUT

See Also:

• Constant Field Values

NAME_NODE_WHITELIST

public static final String NAME_NODE_WHITELIST

See Also:

• Constant Field Values

HADOOP_CONF_DIR

public static final String HADOOP_CONF_DIR

See Also:

• Constant Field Values

Constructor Details

FileSystemAccessService

public FileSystemAccessService()

Method Details

init

protected void init()
             throws ServiceException

Description copied from class: BaseService

Initializes the server.

This method is called by BaseService.init(Server) after all service properties (properties prefixed with

Specified by:

init in class BaseService

Throws:

ServiceException - thrown if the service could not be initialized.

postInit

public void postInit()
              throws ServiceException

Description copied from class: BaseService

Post initializes the service. This method is called by the Server after all services of the server have been initialized.

This method does a NOP.

Specified by:

postInit in interface Service

Overrides:

postInit in class BaseService

Throws:

ServiceException - thrown if the service could not be post-initialized.

getInterface

public Class getInterface()

Description copied from interface: Service

Returns the interface implemented by this service. This interface is used the Server when the Server.get(Class) method is used to retrieve a service.

Specified by:

getInterface in interface Service

Returns:

the interface that identifies the service.

getServiceDependencies

public Class[] getServiceDependencies()

Description copied from class: BaseService

Returns the service dependencies of this service. The service will be instantiated only if all the service dependencies are already initialized.

This method returns an empty array (size 0)

Specified by:

getServiceDependencies in interface Service

Overrides:

getServiceDependencies in class BaseService

Returns:

an empty array (size 0).

getUGI

protected org.apache.hadoop.security.UserGroupInformation getUGI(String user)
                                                          throws IOException

Throws:

IOException

setRequiredServiceHadoopConf

protected void setRequiredServiceHadoopConf(org.apache.hadoop.conf.Configuration conf)

createFileSystem

protected org.apache.hadoop.fs.FileSystem createFileSystem(org.apache.hadoop.conf.Configuration namenodeConf)
                                                    throws IOException

Throws:

IOException

closeFileSystem

protected void closeFileSystem(org.apache.hadoop.fs.FileSystem fs)
                        throws IOException

Throws:

IOException

validateNamenode

protected void validateNamenode(String namenode)
                         throws FileSystemAccessException

Throws:

FileSystemAccessException

checkNameNodeHealth

protected void checkNameNodeHealth(org.apache.hadoop.fs.FileSystem fileSystem)
                            throws FileSystemAccessException

Throws:

FileSystemAccessException

execute

public <T> T execute(String user,
 org.apache.hadoop.conf.Configuration conf,
 FileSystemAccess.FileSystemExecutor<T> executor)
              throws FileSystemAccessException

Specified by:

execute in interface FileSystemAccess

Throws:

FileSystemAccessException

createFileSystemInternal

public org.apache.hadoop.fs.FileSystem createFileSystemInternal(String user,
 org.apache.hadoop.conf.Configuration conf)
                                                         throws IOException,
FileSystemAccessException

Throws:

IOException

FileSystemAccessException

createFileSystem

public org.apache.hadoop.fs.FileSystem createFileSystem(String user,
 org.apache.hadoop.conf.Configuration conf)
                                                 throws IOException,
FileSystemAccessException

Specified by:

createFileSystem in interface FileSystemAccess

Throws:

IOException

FileSystemAccessException

releaseFileSystem

public void releaseFileSystem(org.apache.hadoop.fs.FileSystem fs)
                       throws IOException

Specified by:

releaseFileSystem in interface FileSystemAccess

Throws:

IOException

getFileSystemConfiguration

public org.apache.hadoop.conf.Configuration getFileSystemConfiguration()

Specified by:

getFileSystemConfiguration in interface FileSystemAccess