org.apache.hadoop.fs

类 RawLocalFileSystem

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FileSystem

org.apache.hadoop.fs.RawLocalFileSystem

所有已实现的接口:

Closeable, AutoCloseable, Configurable

public class RawLocalFileSystem
extends FileSystem

Implement the FileSystem API for the raw local filesystem.

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
RawLocalFileSystem()

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) Append to an existing file (optional operation).
void	close() No more filesystem operations are needed.
void	completeLocalOutput(Path fsWorkingFile, Path tmpLocalFile) Called when we're all done writing to the target.
FSDataOutputStream	create(Path f, boolean overwrite, int bufferSize, short replication, long blockSize, Progressable progress) Opens an FSDataOutputStream at the indicated Path with write-progress reporting.
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.
FSDataOutputStream	createNonRecursive(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 p) 已过时。
boolean	delete(Path p, boolean recursive) Delete a file.
FileStatus	getFileStatus(Path f) Return a file status object that represents the path.
Path	getHomeDirectory() Return the current user's home directory in this filesystem.
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.
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) Creates the specified directory hierarchy.
boolean	mkdirs(Path f, FsPermission permission) Make the given file and all non-existent parents into directories.
void	moveFromLocalFile(Path src, Path dst) The src file is on the local disk.
FSDataInputStream	open(Path f, int bufferSize) Opens an FSDataInputStream at the indicated Path.
File	pathToFile(Path path) Convert a path to a File.
boolean	rename(Path src, Path dst) Renames Path src to Path dst.
void	setOwner(Path p, String username, String groupname) Use the command chown to set owner.
void	setPermission(Path p, FsPermission permission) Use the command chmod to set permission.
void	setWorkingDirectory(Path newDir) Set the working directory to the given directory.
Path	startLocalOutput(Path fsOutputFile, Path tmpLocalFile) Returns a local File that the user can write output to.
String	toString()

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

addFileSystemForTesting, append, append, checkPath, clearStatistics, closeAll, closeAllForUGI, concat, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, createNewFile, createNonRecursive, deleteOnExit, exists, get, get, get, getAllStatistics, getBlockSize, getCacheSize, getCanonicalServiceName, getCanonicalUri, getContentSummary, getDefaultBlockSize, getDefaultBlockSize, getDefaultPort, getDefaultReplication, getDefaultReplication, getDefaultUri, getDelegationToken, getFileBlockLocations, getFileChecksum, getLength, getLocal, getName, getNamed, getReplication, getStatistics, getStatistics, getUsed, globStatus, globStatus, isDirectory, isFile, listStatus, listStatus, listStatus, makeQualified, mkdirs, moveFromLocalFile, moveToLocalFile, open, printStatistics, processDeleteOnExit, setDefaultUri, setDefaultUri, setReplication, 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, wait, wait, wait

构造器详细资料

RawLocalFileSystem

public RawLocalFileSystem()

方法详细资料

pathToFile

public File pathToFile(Path path)

Convert a path to a File.

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

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

append

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

Append to an existing file (optional operation).

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,
                        boolean overwrite,
                        int bufferSize,
                        short replication,
                        long blockSize,
                        Progressable progress)
                          throws IOException

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

覆盖:

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

create

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

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)

createNonRecursive

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

Opens an FSDataOutputStream at the indicated Path with write-progress reporting. Same as create(), except fails if parent directory doesn't already exist.

覆盖:

createNonRecursive 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 p)
               throws IOException

已过时。

指定者:

delete 在类中 FileSystem

抛出:

IOException

delete

public boolean delete(Path p,
             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:

p - 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

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

mkdirs

public boolean mkdirs(Path f)
               throws IOException

Creates the specified directory hierarchy. Does not treat existence as an error.

覆盖:

mkdirs 在类中 FileSystem

抛出:

IOException

mkdirs

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

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

getHomeDirectory

public Path getHomeDirectory()

从类复制的说明: FileSystem

Return the current user's home directory in this filesystem. The default implementation returns "/user/$USER/".

覆盖:

getHomeDirectory 在类中 FileSystem

setWorkingDirectory

public void setWorkingDirectory(Path newDir)

Set the working directory to the given directory.

指定者:

setWorkingDirectory 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

moveFromLocalFile

public void moveFromLocalFile(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, removing the source afterwards.

覆盖:

moveFromLocalFile 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 fsWorkingFile,
                       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

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

toString

public String toString()

覆盖:

toString 在类中 Object

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

setOwner

public void setOwner(Path p,
            String username,
            String groupname)
              throws IOException

Use the command chown to set owner.

覆盖:

setOwner 在类中 FileSystem

参数:

p - The path

username - If it is null, the original username remains unchanged.

groupname - If it is null, the original groupname remains unchanged.

抛出:

IOException

setPermission

public void setPermission(Path p,
                 FsPermission permission)
                   throws IOException

Use the command chmod to set permission.

覆盖:

setPermission 在类中 FileSystem

抛出:

IOException