org.apache.hadoop.hdfs

类 HftpFileSystem

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FileSystem

org.apache.hadoop.hdfs.HftpFileSystem

所有已实现的接口:

Closeable, AutoCloseable, Configurable, DelegationTokenRenewer.Renewable

直接已知子类:

HsftpFileSystem

public class HftpFileSystem
extends FileSystem
implements DelegationTokenRenewer.Renewable

An implementation of a protocol for accessing filesystems over HTTP. The following implementation provides a limited, read-only interface to a filesystem over HTTP.

另请参阅:

ListPathsServlet, FileDataServlet

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	HftpFileSystem.TokenManager

从类继承的嵌套类/接口 org.apache.hadoop.fs.FileSystem

FileSystem.Statistics

字段概要

字段

限定符和类型	字段和说明
protected static ThreadLocal<SimpleDateFormat>	df
static String	HFTP_DATE_FORMAT
static String	HFTP_TIMEZONE
protected InetSocketAddress	nnAddr
static Text	TOKEN_KIND
protected UserGroupInformation	ugi

从类继承的字段 org.apache.hadoop.fs.FileSystem

FS_DEFAULT_NAME_KEY, LOG, statistics

构造器概要

构造器

构造器和说明
HftpFileSystem()

方法概要

方法

限定符和类型	方法和说明
FSDataOutputStream	append(Path f, int bufferSize, Progressable progress) This optional operation is not yet supported.
void	close() No more filesystem operations are needed.
FSDataOutputStream	create(Path f, FsPermission permission, boolean overwrite, int bufferSize, short replication, long blockSize, Progressable progress) Opens an FSDataOutputStream at the indicated Path with write-progress reporting.
boolean	delete(Path f) 已过时。
boolean	delete(Path f, boolean recursive) Delete a file.
String	getCanonicalServiceName() Get a canonical service name for this file system.
ContentSummary	getContentSummary(Path f) Return the ContentSummary of a given Path.
static SimpleDateFormat	getDateFormat()
protected int	getDefaultPort() Get the default port for this file system.
Token<?>	getDelegationToken(String renewer) Get a new delegation token for this file system.
FileChecksum	getFileChecksum(Path f) Get the checksum of a file.
FileStatus	getFileStatus(Path f) Return a file status object that represents the path.
protected InetSocketAddress	getNamenodeAddr(URI uri)
Token<?>	getRenewToken()
protected String	getUnderlyingProtocol() Return the underlying protocol that is used to talk to the namenode.
URI	getUri() Returns a URI whose scheme and authority identify this FileSystem.
Path	getWorkingDirectory() Get the current working directory for the given file system
protected void	initDelegationToken()
void	initialize(URI name, Configuration conf) Called after a new FileSystem instance is constructed.
FileStatus[]	listStatus(Path f) List the statuses of the files/directories in the given path if the path is a directory.
boolean	mkdirs(Path f, FsPermission permission) Make the given file and all non-existent parents into directories.
FSDataInputStream	open(Path f, int buffersize) Opens an FSDataInputStream at the indicated Path.
protected HttpURLConnection	openConnection(String path, String query) Open an HTTP connection to the namenode to read file data and metadata.
boolean	rename(Path src, Path dst) Renames Path src to Path dst.
protected Token<DelegationTokenIdentifier>	selectHdfsDelegationToken()
protected Token<DelegationTokenIdentifier>	selectHftpDelegationToken()
<T extends TokenIdentifier> void	setDelegationToken(Token<T> token) Set delegation token.
void	setWorkingDirectory(Path f) Set the current working directory for the given file system.
protected String	updateQuery(String query)

从类继承的方法 org.apache.hadoop.fs.FileSystem

addFileSystemForTesting, append, append, checkPath, clearStatistics, closeAll, closeAllForUGI, completeLocalOutput, concat, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, createNewFile, createNonRecursive, createNonRecursive, deleteOnExit, exists, get, get, get, getAllStatistics, getBlockSize, getCacheSize, getCanonicalUri, getDefaultBlockSize, getDefaultBlockSize, getDefaultReplication, getDefaultReplication, getDefaultUri, getFileBlockLocations, getHomeDirectory, getLength, getLocal, getName, getNamed, getReplication, getStatistics, getStatistics, getUsed, globStatus, globStatus, isDirectory, isFile, listStatus, listStatus, listStatus, makeQualified, mkdirs, mkdirs, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, open, printStatistics, processDeleteOnExit, setDefaultUri, setDefaultUri, setOwner, setPermission, setReplication, setTimes, setVerifyChecksum, startLocalOutput

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

字段详细资料

TOKEN_KIND

public static final Text TOKEN_KIND

ugi

protected UserGroupInformation ugi

nnAddr

protected InetSocketAddress nnAddr

HFTP_TIMEZONE

public static final String HFTP_TIMEZONE

另请参阅:

常量字段值

HFTP_DATE_FORMAT

public static final String HFTP_DATE_FORMAT

另请参阅:

常量字段值

df

protected static final ThreadLocal<SimpleDateFormat> df

构造器详细资料

HftpFileSystem

public HftpFileSystem()

方法详细资料

getDateFormat

public static final SimpleDateFormat getDateFormat()

getDefaultPort

protected int getDefaultPort()

从类复制的说明: FileSystem

Get the default port for this file system.

覆盖:

getDefaultPort 在类中 FileSystem

返回:

the default port or 0 if there isn't one

getNamenodeAddr

protected InetSocketAddress getNamenodeAddr(URI uri)

getCanonicalServiceName

public String getCanonicalServiceName()

从类复制的说明: FileSystem

Get a canonical service name for this file system. The token cache is the only user of this value, and uses it to lookup this filesystem's service tokens. The token cache will not attempt to acquire tokens if the service is null.

覆盖:

getCanonicalServiceName 在类中 FileSystem

返回:

a service string that uniquely identifies this file system, null if the filesystem does not implement tokens

另请参阅:

SecurityUtil.buildDTServiceName(URI, int)

initialize

public void initialize(URI name,
              Configuration conf)
                throws IOException

从类复制的说明: FileSystem

Called after a new FileSystem instance is constructed.

覆盖:

initialize 在类中 FileSystem

参数:

name - a uri whose authority section names the host, port, etc. for this FileSystem

conf - the configuration

抛出:

IOException

initDelegationToken

protected void initDelegationToken()
                            throws IOException

抛出:

IOException

selectHftpDelegationToken

protected Token<DelegationTokenIdentifier> selectHftpDelegationToken()

selectHdfsDelegationToken

protected Token<DelegationTokenIdentifier> selectHdfsDelegationToken()

close

public void close()
           throws IOException

从类复制的说明: FileSystem

No more filesystem operations are needed. Will release any held locks.

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

覆盖:

close 在类中 FileSystem

抛出:

IOException

getRenewToken

public Token<?> getRenewToken()

指定者:

getRenewToken 在接口中 DelegationTokenRenewer.Renewable

返回:

the renew token.

getUnderlyingProtocol

protected String getUnderlyingProtocol()

Return the underlying protocol that is used to talk to the namenode.

setDelegationToken

public <T extends TokenIdentifier> void setDelegationToken(Token<T> token)

从接口复制的说明: DelegationTokenRenewer.Renewable

Set delegation token.

指定者:

setDelegationToken 在接口中 DelegationTokenRenewer.Renewable

getDelegationToken

public Token<?> getDelegationToken(String renewer)
                            throws IOException

从类复制的说明: FileSystem

Get a new delegation token for this file system.

覆盖:

getDelegationToken 在类中 FileSystem

参数:

renewer - the account name that is allowed to renew the token.

返回:

a new delegation token

抛出:

IOException

getUri

public URI getUri()

从类复制的说明: FileSystem

Returns a URI whose scheme and authority identify this FileSystem.

指定者:

getUri 在类中 FileSystem

openConnection

protected HttpURLConnection openConnection(String path,
                               String query)
                                    throws IOException

Open an HTTP connection to the namenode to read file data and metadata.

参数:

path - The path component of the URL

query - The query component of the URL

抛出:

IOException

updateQuery

protected String updateQuery(String query)
                      throws IOException

抛出:

IOException

open

public FSDataInputStream open(Path f,
                     int buffersize)
                       throws IOException

从类复制的说明: FileSystem

Opens an FSDataInputStream at the indicated Path.

指定者:

open 在类中 FileSystem

参数:

f - the file name to open

buffersize - the size of the buffer to be used.

抛出:

IOException

listStatus

public FileStatus[] listStatus(Path f)
                        throws IOException

从类复制的说明: FileSystem

List the statuses of the files/directories in the given path if the path is a directory.

指定者:

listStatus 在类中 FileSystem

参数:

f - given path

返回:

the statuses of the files/directories in the given patch returns null, if Path f does not exist in the FileSystem

抛出:

IOException

getFileStatus

public FileStatus getFileStatus(Path f)
                         throws IOException

从类复制的说明: FileSystem

Return a file status object that represents the path.

指定者:

getFileStatus 在类中 FileSystem

参数:

f - The path we want information from

返回:

a FileStatus object

抛出:

FileNotFoundException - when the path does not exist; IOException see specific implementation

IOException

getFileChecksum

public FileChecksum getFileChecksum(Path f)
                             throws IOException

Get the checksum of a file.

覆盖:

getFileChecksum 在类中 FileSystem

参数:

f - The file path

返回:

The file checksum. The default return value is null, which indicates that no checksum algorithm is implemented in the corresponding FileSystem.

抛出:

IOException

getWorkingDirectory

public Path getWorkingDirectory()

从类复制的说明: FileSystem

Get the current working directory for the given file system

指定者:

getWorkingDirectory 在类中 FileSystem

返回:

the directory pathname

setWorkingDirectory

public void setWorkingDirectory(Path f)

从类复制的说明: FileSystem

Set the current working directory for the given file system. All relative paths will be resolved relative to it.

指定者:

setWorkingDirectory 在类中 FileSystem

append

public FSDataOutputStream append(Path f,
                        int bufferSize,
                        Progressable progress)
                          throws IOException

This optional operation is not yet supported.

指定者:

append 在类中 FileSystem

参数:

f - the existing file to be appended.

bufferSize - the size of the buffer to be used.

progress - for reporting progress if it is not null.

抛出:

IOException

create

public FSDataOutputStream create(Path f,
                        FsPermission permission,
                        boolean overwrite,
                        int bufferSize,
                        short replication,
                        long blockSize,
                        Progressable progress)
                          throws IOException

从类复制的说明: FileSystem

Opens an FSDataOutputStream at the indicated Path with write-progress reporting.

指定者:

create 在类中 FileSystem

参数:

f - the file name to open

overwrite - if a file with this name already exists, then if true, the file will be overwritten, and if false an error will be thrown.

bufferSize - the size of the buffer to be used.

replication - required block replication for the file.

抛出:

IOException

另请参阅:

FileSystem.setPermission(Path, FsPermission)

rename

public boolean rename(Path src,
             Path dst)
               throws IOException

从类复制的说明: FileSystem

Renames Path src to Path dst. Can take place on local fs or remote DFS.

指定者:

rename 在类中 FileSystem

抛出:

IOException

delete

@Deprecated
public boolean delete(Path f)
               throws IOException

已过时。

指定者:

delete 在类中 FileSystem

抛出:

IOException

delete

public boolean delete(Path f,
             boolean recursive)
               throws IOException

从类复制的说明: FileSystem

Delete a file.

指定者:

delete 在类中 FileSystem

参数:

f - the path to delete.

recursive - if path is a directory and set to true, the directory is deleted else throws an exception. In case of a file the recursive can be set to either true or false.

返回:

true if delete is successful else false.

抛出:

IOException

mkdirs

public boolean mkdirs(Path f,
             FsPermission permission)
               throws IOException

从类复制的说明: FileSystem

Make the given file and all non-existent parents into directories. Has the semantics of Unix 'mkdir -p'. Existence of the directory hierarchy is not an error.

指定者:

mkdirs 在类中 FileSystem

抛出:

IOException

getContentSummary

public ContentSummary getContentSummary(Path f)
                                 throws IOException

Return the ContentSummary of a given Path.

覆盖:

getContentSummary 在类中 FileSystem

抛出:

IOException