org.apache.hadoop.fs

Class RawLocalFileSystem

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FileSystem

org.apache.hadoop.fs.RawLocalFileSystem

All Implemented Interfaces:

Closeable, AutoCloseable, Configurable

@InterfaceAudience.Public
@InterfaceStability.Stable
public class RawLocalFileSystem
extends FileSystem

Implement the FileSystem API for the raw local filesystem.

Field Summary

Fields inherited from class org.apache.hadoop.fs.FileSystem

DEFAULT_FILTER, DEFAULT_FS, FS_DEFAULT_NAME_KEY, LOG, SHUTDOWN_HOOK_PRIORITY, statistics

Constructor Summary

Constructors

Constructor and Description
RawLocalFileSystem()

Method Summary

Methods

Modifier and Type	Method and Description
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) Create 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) Create 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, boolean recursive) Delete the given path to a file or directory.
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.
protected Path	getInitialWorkingDirectory() Note: with the new FilesContext class, getWorkingDirectory() will be removed.
FsStatus	getStatus(Path p) Returns a status object describing the use and capacity of the file system.
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.
protected boolean	primitiveMkdir(Path f, FsPermission absolutePermission) This version of the mkdirs method assumes that the permission is absolute.
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()

Methods inherited from class org.apache.hadoop.fs.FileSystem

append, append, cancelDeleteOnExit, checkPath, clearStatistics, closeAll, closeAllForUGI, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, createNewFile, createNonRecursive, delete, deleteOnExit, exists, get, get, get, getAllStatistics, getBlockSize, getCanonicalUri, getContentSummary, getDefaultBlockSize, getDefaultBlockSize, getDefaultPort, getDefaultReplication, getDefaultReplication, getDefaultUri, getFileBlockLocations, getFileBlockLocations, getFileChecksum, getLength, getLocal, getName, getNamed, getReplication, getServerDefaults, getServerDefaults, getStatistics, getStatistics, getStatus, getUsed, globStatus, globStatus, isDirectory, isFile, listCorruptFileBlocks, listFiles, listLocatedStatus, listLocatedStatus, listStatus, listStatus, listStatus, makeQualified, mkdirs, moveFromLocalFile, moveToLocalFile, newInstance, newInstance, newInstance, newInstanceLocal, open, primitiveCreate, primitiveMkdir, printStatistics, processDeleteOnExit, rename, resolvePath, setDefaultUri, setDefaultUri, setReplication, setTimes, setVerifyChecksum, setWriteChecksum

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Constructor Detail

RawLocalFileSystem

public RawLocalFileSystem()

Method Detail

pathToFile

public File pathToFile(Path path)

Convert a path to a File.

getUri

public URI getUri()

Description copied from class: FileSystem

Returns a URI whose scheme and authority identify this FileSystem.

Specified by:

getUri in class FileSystem

initialize

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

Description copied from class: FileSystem

Called after a new FileSystem instance is constructed.

Overrides:

initialize in class FileSystem

Parameters:

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

conf - the configuration

Throws:

IOException

open

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

Description copied from class: FileSystem

Opens an FSDataInputStream at the indicated Path.

Specified by:

open in class FileSystem

Parameters:

f - the file name to open

bufferSize - the size of the buffer to be used.

Throws:

IOException

append

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

Append to an existing file (optional operation).

Specified by:

append in class FileSystem

Parameters:

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.

Throws:

IOException

create

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

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

Overrides:

create in class FileSystem

Parameters:

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.

Throws:

IOException

create

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

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

Specified by:

create in class FileSystem

Parameters:

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.

Throws:

IOException

See Also:

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.

Overrides:

createNonRecursive in class FileSystem

Parameters:

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.

Throws:

IOException

See Also:

FileSystem.setPermission(Path, FsPermission)

rename

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

Description copied from class: FileSystem

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

Specified by:

rename in class FileSystem

Parameters:

src - path to be renamed

dst - new path after rename

Returns:

true if rename is successful

Throws:

IOException - on failure

delete

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

Delete the given path to a file or directory.

Specified by:

delete in class FileSystem

Parameters:

p - the path to delete

recursive - to delete sub-directories

Returns:

true if the file or directory and all its contents were deleted

Throws:

IOException - if p is non-empty and recursive is false

listStatus

public FileStatus[] listStatus(Path f)
                        throws IOException

Description copied from class: FileSystem

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

Specified by:

listStatus in class FileSystem

Parameters:

f - given path

Returns:

the statuses of the files/directories in the given patch

Throws:

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

IOException

mkdirs

public boolean mkdirs(Path f)
               throws IOException

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

Overrides:

mkdirs in class FileSystem

Throws:

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.

Specified by:

mkdirs in class FileSystem

Parameters:

f - path to create

permission - to apply to f

Throws:

IOException

primitiveMkdir

protected boolean primitiveMkdir(Path f,
                     FsPermission absolutePermission)
                          throws IOException

Description copied from class: FileSystem

This version of the mkdirs method assumes that the permission is absolute. It has been added to support the FileContext that processes the permission with umask before calling this method. This a temporary method added to support the transition from FileSystem to FileContext for user applications.

Overrides:

primitiveMkdir in class FileSystem

Throws:

IOException

getHomeDirectory

public Path getHomeDirectory()

Description copied from class: FileSystem

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

Overrides:

getHomeDirectory in class FileSystem

setWorkingDirectory

public void setWorkingDirectory(Path newDir)

Set the working directory to the given directory.

Specified by:

setWorkingDirectory in class FileSystem

getWorkingDirectory

public Path getWorkingDirectory()

Description copied from class: FileSystem

Get the current working directory for the given file system

Specified by:

getWorkingDirectory in class FileSystem

Returns:

the directory pathname

getInitialWorkingDirectory

protected Path getInitialWorkingDirectory()

Description copied from class: FileSystem

Note: with the new FilesContext class, getWorkingDirectory() will be removed. The working directory is implemented in FilesContext. Some file systems like LocalFileSystem have an initial workingDir that we use as the starting workingDir. For other file systems like HDFS there is no built in notion of an inital workingDir.

Overrides:

getInitialWorkingDirectory in class FileSystem

Returns:

if there is built in notion of workingDir then it is returned; else a null is returned.

getStatus

public FsStatus getStatus(Path p)
                   throws IOException

Returns a status object describing the use and capacity of the file system. If the file system has multiple partitions, the use and capacity of the partition pointed to by the specified path is reflected.

Overrides:

getStatus in class FileSystem

Parameters:

p - Path for which status should be obtained. null means the default partition.

Returns:

a FsStatus object

Throws:

IOException - see specific implementation

moveFromLocalFile

public void moveFromLocalFile(Path src,
                     Path dst)
                       throws IOException

Description copied from class: FileSystem

The src file is on the local disk. Add it to FS at the given dst name, removing the source afterwards.

Overrides:

moveFromLocalFile in class FileSystem

Parameters:

src - path

dst - path

Throws:

IOException

startLocalOutput

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

Description copied from class: 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.

Overrides:

startLocalOutput in class FileSystem

Parameters:

fsOutputFile - path of output file

tmpLocalFile - path of local tmp file

Throws:

IOException

completeLocalOutput

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

Description copied from class: 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.

Overrides:

completeLocalOutput in class FileSystem

Parameters:

fsWorkingFile - path of output file

tmpLocalFile - path to local tmp file

Throws:

IOException

close

public void close()
           throws IOException

Description copied from class: FileSystem

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

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class FileSystem

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

getFileStatus

public FileStatus getFileStatus(Path f)
                         throws IOException

Description copied from class: FileSystem

Return a file status object that represents the path.

Specified by:

getFileStatus in class FileSystem

Parameters:

f - The path we want information from

Returns:

a FileStatus object

Throws:

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.

Overrides:

setOwner in class FileSystem

Parameters:

p - The path

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

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

Throws:

IOException

setPermission

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

Use the command chmod to set permission.

Overrides:

setPermission in class FileSystem

Throws:

IOException