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:

Configurable

public class RawLocalFileSystem
extends FileSystem

Implement the FileSystem API for the raw local filesystem.

Author:

Mike Cafarella

Field Summary

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

LOG

Constructor Summary

RawLocalFileSystem()

Method Summary

void	close() No more filesystem operations are needed.
void	completeLocalOutput(Path fsWorkingFile, 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 f, 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) Delete a file
boolean	exists(Path f) Check if exists.
long	getBlockSize(Path filename) Get the block size for a particular file.
short	getDefaultReplication() Get the default replication.
String[][]	getFileCacheHints(Path f, long start, long len) Return 1x1 'localhost' cell if the file exists.
long	getLength(Path f) The number of bytes in a file.
String	getName() Deprecated.
short	getReplication(Path f) Replication is not supported for the local 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.
boolean	isDirectory(Path f) True iff the named path is a directory.
Path[]	listPaths(Path f) List files in a directory.
void	lock(Path p, boolean shared) Deprecated.
boolean	mkdirs(Path f) Creates the specified directory hierarchy.
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.
void	release(Path p) Deprecated.
boolean	rename(Path src, Path dst) Renames Path src to Path dst.
boolean	setReplication(Path src, short replication) Set the replication of the given file
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

checkPath, closeAll, copyFromLocalFile, copyToLocalFile, create, create, create, create, create, create, create, createNewFile, get, get, getContentLength, getDefaultBlockSize, getLocal, getNamed, getUsed, globPaths, globPaths, isFile, listPaths, listPaths, listPaths, makeQualified, moveToLocalFile, open, parseArgs

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.

getFileCacheHints

public String[][] getFileCacheHints(Path f,
                                    long start,
                                    long len)
                             throws IOException

Return 1x1 'localhost' cell if the file exists. Return null if otherwise.

Specified by:

getFileCacheHints in class FileSystem

Throws:

IOException

getName

public String getName()

Deprecated.

Specified by:

getName in class FileSystem

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)

Description copied from class: FileSystem

Called after a new FileSystem instance is constructed.

Specified by:

initialize in class FileSystem

Parameters:

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

conf - the configuration

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

create

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

Description copied from class: FileSystem

Opens 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

getReplication

public short getReplication(Path f)
                     throws IOException

Replication is not supported for the local file system.

Specified by:

getReplication in class FileSystem

Parameters:

f - file name

Returns:

file replication

Throws:

IOException

setReplication

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

Set the replication of the given file

Specified by:

setReplication in class FileSystem

Parameters:

src - file name

replication - new replication

Returns:

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

Throws:

IOException

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

Throws:

IOException

delete

public boolean delete(Path p)
               throws IOException

Description copied from class: FileSystem

Delete a file

Specified by:

delete in class FileSystem

Throws:

IOException

exists

public boolean exists(Path f)
               throws IOException

Description copied from class: FileSystem

Check if exists.

Specified by:

exists in class FileSystem

Parameters:

f - source file

Throws:

IOException

isDirectory

public boolean isDirectory(Path f)
                    throws IOException

Description copied from class: FileSystem

True iff the named path is a directory.

Specified by:

isDirectory in class FileSystem

Throws:

IOException

getLength

public long getLength(Path f)
               throws IOException

Description copied from class: FileSystem

The number of bytes in a file.

Specified by:

getLength in class FileSystem

Throws:

IOException

listPaths

public Path[] listPaths(Path f)
                 throws IOException

Description copied from class: FileSystem

List files in a directory.

Specified by:

listPaths in class FileSystem

Throws:

IOException

mkdirs

public boolean mkdirs(Path f)
               throws IOException

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

Specified by:

mkdirs in class FileSystem

Throws:

IOException

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

lock

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

Deprecated.

Description copied from class: FileSystem

Obtain a lock on the given Path

Specified by:

lock in class FileSystem

Throws:

IOException

release

@Deprecated
public void release(Path p)
             throws IOException

Deprecated.

Description copied from class: FileSystem

Release the lock

Specified by:

release in class FileSystem

Throws:

IOException

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

Throws:

IOException

copyFromLocalFile

public void copyFromLocalFile(boolean delSrc,
                              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. delSrc indicates if the source should be removed

Specified by:

copyFromLocalFile in class FileSystem

Throws:

IOException

copyToLocalFile

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

Description copied from class: 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.

Specified by:

copyToLocalFile in class FileSystem

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.

Specified by:

startLocalOutput in class FileSystem

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.

Specified by:

completeLocalOutput in class FileSystem

Throws:

IOException

close

public void close()
           throws IOException

Description copied from class: FileSystem

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

Overrides:

close in class FileSystem

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

getBlockSize

public long getBlockSize(Path filename)

Description copied from class: FileSystem

Get the block size for a particular file.

Specified by:

getBlockSize in class FileSystem

Parameters:

filename - the filename

Returns:

the number of bytes in a block

getDefaultReplication

public short getDefaultReplication()

Description copied from class: FileSystem

Get the default replication.

Specified by:

getDefaultReplication in class FileSystem