org.apache.hadoop.fs.kfs

类 KosmosFileSystem

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FileSystem

org.apache.hadoop.fs.kfs.KosmosFileSystem

所有已实现的接口:

Closeable, AutoCloseable, Configurable

public class KosmosFileSystem
extends FileSystem

A FileSystem backed by KFS.

嵌套类概要

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

FileSystem.Statistics

字段概要

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
KosmosFileSystem()

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	completeLocalOutput(Path fsOutputFile, Path tmpLocalFile) Called when we're all done writing to the target.
void	copyFromLocalFile(boolean delSrc, Path src, Path dst) The src file is on the local disk.
void	copyToLocalFile(boolean delSrc, Path src, Path dst) The src file is under FS, and the dst is on the local disk.
FSDataOutputStream	create(Path file, 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 path) 已过时。
boolean	delete(Path path, boolean recursive) Delete a file.
long	getDefaultBlockSize() Return the number of bytes that large input files should be optimally be split into to minimize i/o time.
short	getDefaultReplication() Get the default replication.
BlockLocation[]	getFileBlockLocations(FileStatus file, long start, long len) Return null if the file doesn't exist; otherwise, get the locations of the various chunks of the file file from KFS.
FileStatus	getFileStatus(Path path) Return a file status object that represents the path.
long	getLength(Path path) 已过时。
String	getName() 已过时。
short	getReplication(Path path) 已过时。
URI	getUri() Returns a URI whose scheme and authority identify this FileSystem.
Path	getWorkingDirectory() Get the current working directory for the given file system
void	initialize(URI uri, Configuration conf) Called after a new FileSystem instance is constructed.
boolean	isDirectory(Path path) 已过时。
boolean	isFile(Path path) 已过时。
FileStatus[]	listStatus(Path path) List the statuses of the files/directories in the given path if the path is a directory.
void	lock(Path path, boolean shared) 已过时。
boolean	mkdirs(Path path, FsPermission permission) Make the given file and all non-existent parents into directories.
FSDataInputStream	open(Path path, int bufferSize) Opens an FSDataInputStream at the indicated Path.
void	release(Path path) 已过时。
boolean	rename(Path src, Path dst) Renames Path src to Path dst.
boolean	setReplication(Path path, short replication) Set replication for an existing file.
void	setWorkingDirectory(Path dir) Set the current working directory for the given file system.
Path	startLocalOutput(Path fsOutputFile, Path tmpLocalFile) Returns a local File that the user can write output to.

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

addFileSystemForTesting, append, append, checkPath, clearStatistics, close, closeAll, closeAllForUGI, concat, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, createNewFile, createNonRecursive, createNonRecursive, deleteOnExit, exists, get, get, get, getAllStatistics, getBlockSize, getCacheSize, getCanonicalServiceName, getCanonicalUri, getContentSummary, getDefaultBlockSize, getDefaultPort, getDefaultReplication, getDefaultUri, getDelegationToken, getFileChecksum, getHomeDirectory, getLocal, getNamed, getStatistics, getStatistics, getUsed, globStatus, globStatus, listStatus, listStatus, listStatus, makeQualified, mkdirs, mkdirs, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, open, printStatistics, processDeleteOnExit, setDefaultUri, setDefaultUri, setOwner, setPermission, setTimes, setVerifyChecksum

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

构造器详细资料

KosmosFileSystem

public KosmosFileSystem()

方法详细资料

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

initialize

public void initialize(URI uri,
              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:

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

conf - the configuration

抛出:

IOException

getName

@Deprecated
public String getName()

已过时。

覆盖:

getName 在类中 FileSystem

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 dir)

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

mkdirs

public boolean mkdirs(Path path,
             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

isDirectory

@Deprecated
public boolean isDirectory(Path path)
                    throws IOException

已过时。

覆盖:

isDirectory 在类中 FileSystem

抛出:

IOException

isFile

@Deprecated
public boolean isFile(Path path)
               throws IOException

已过时。

从类复制的说明: FileSystem

True iff the named path is a regular file.

覆盖:

isFile 在类中 FileSystem

抛出:

IOException

listStatus

public FileStatus[] listStatus(Path path)
                        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:

path - 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 path)
                         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:

path - 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

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 file,
                        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:

file - 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)

open

public FSDataInputStream open(Path path,
                     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:

path - the file name to open

bufferSize - the size of the buffer to be used.

抛出:

IOException

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

public boolean delete(Path path,
             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:

path - 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

delete

@Deprecated
public boolean delete(Path path)
               throws IOException

已过时。

指定者:

delete 在类中 FileSystem

抛出:

IOException

getLength

@Deprecated
public long getLength(Path path)
               throws IOException

已过时。

覆盖:

getLength 在类中 FileSystem

抛出:

IOException

getReplication

@Deprecated
public short getReplication(Path path)
                     throws IOException

已过时。

从类复制的说明: FileSystem

Get replication.

覆盖:

getReplication 在类中 FileSystem

参数:

path - file name

返回:

file replication

抛出:

IOException

getDefaultReplication

public short getDefaultReplication()

从类复制的说明: FileSystem

Get the default replication.

覆盖:

getDefaultReplication 在类中 FileSystem

setReplication

public boolean setReplication(Path path,
                     short replication)
                       throws IOException

从类复制的说明: FileSystem

Set replication for an existing file.

覆盖:

setReplication 在类中 FileSystem

参数:

path - file name

replication - new replication

返回:

true if successful; false if file does not exist or is a directory

抛出:

IOException

getDefaultBlockSize

public long getDefaultBlockSize()

从类复制的说明: FileSystem

Return the number of bytes that large input files should be optimally be split into to minimize i/o time.

覆盖:

getDefaultBlockSize 在类中 FileSystem

lock

@Deprecated
public void lock(Path path,
                   boolean shared)
          throws IOException

已过时。

抛出:

IOException

release

@Deprecated
public void release(Path path)
             throws IOException

已过时。

抛出:

IOException

getFileBlockLocations

public BlockLocation[] getFileBlockLocations(FileStatus file,
                                    long start,
                                    long len)
                                      throws IOException

Return null if the file doesn't exist; otherwise, get the locations of the various chunks of the file file from KFS.

覆盖:

getFileBlockLocations 在类中 FileSystem

抛出:

IOException

copyFromLocalFile

public void copyFromLocalFile(boolean delSrc,
                     Path src,
                     Path dst)
                       throws IOException

从类复制的说明: FileSystem

The src file is on the local disk. Add it to FS at the given dst name. delSrc indicates if the source should be removed

覆盖:

copyFromLocalFile 在类中 FileSystem

抛出:

IOException

copyToLocalFile

public void copyToLocalFile(boolean delSrc,
                   Path src,
                   Path dst)
                     throws IOException

从类复制的说明: FileSystem

The src file is under FS, and the dst is on the local disk. Copy it from FS control to the local dst name. delSrc indicates if the src will be removed or not.

覆盖:

copyToLocalFile 在类中 FileSystem

抛出:

IOException

startLocalOutput

public Path startLocalOutput(Path fsOutputFile,
                    Path tmpLocalFile)
                      throws IOException

从类复制的说明: FileSystem

Returns a local File that the user can write output to. The caller provides both the eventual FS target name and the local working file. If the FS is local, we write directly into the target. If the FS is remote, we write into the tmp local area.

覆盖:

startLocalOutput 在类中 FileSystem

抛出:

IOException

completeLocalOutput

public void completeLocalOutput(Path fsOutputFile,
                       Path tmpLocalFile)
                         throws IOException

从类复制的说明: FileSystem

Called when we're all done writing to the target. A local FS will do nothing, because we've written to exactly the right place. A remote FS will copy the contents of tmpLocalFile to the correct target at fsOutputFile.

覆盖:

completeLocalOutput 在类中 FileSystem

抛出:

IOException