org.apache.hadoop.dfs
Class HftpFileSystem

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.hadoop.fs.FileSystem
          org.apache.hadoop.dfs.HftpFileSystem

All Implemented Interfaces:

Closeable, Configurable

Direct Known Subclasses:

HsftpFileSystem

public class HftpFileSystem
extends FileSystem

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

See Also:

ListPathsServlet, FileDataServlet

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.fs.FileSystem

FileSystem.Statistics

Field Summary

protected static SimpleDateFormat	df
protected InetSocketAddress	nnAddr
protected UserGroupInformation	ugi

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

LOG, statistics

Constructor Summary

HftpFileSystem()

Method Summary

FSDataOutputStream	append(Path f, int bufferSize, Progressable progress) This optional operation is not yet supported.
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) Deprecated.
boolean	delete(Path f, boolean recursive) Delete a file.
FileStatus	getFileStatus(Path f) Return a file status object that represents the path.
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 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.
void	setWorkingDirectory(Path f) Set the current working directory for the given file system.

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

append, append, checkPath, close, closeAll, completeLocalOutput, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, createNewFile, deleteOnExit, exists, get, get, getBlockSize, getContentSummary, getDefaultBlockSize, getDefaultReplication, getDefaultUri, getFileBlockLocations, getFileBlockLocations, getHomeDirectory, getLength, getLocal, getName, getNamed, getReplication, getStatistics, getUsed, globStatus, globStatus, isDirectory, isFile, listStatus, listStatus, listStatus, makeQualified, mkdirs, mkdirs, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, open, parseArgs, printStatistics, processDeleteOnExit, setDefaultUri, setDefaultUri, setOwner, setPermission, setReplication, startLocalOutput

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, toString, wait, wait, wait

Field Detail

nnAddr

protected InetSocketAddress nnAddr

ugi

protected UserGroupInformation ugi

df

protected static final SimpleDateFormat df

Constructor Detail

HftpFileSystem

public HftpFileSystem()

Method Detail

initialize

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

Description copied from class: FileSystem

Called after a new FileSystem instance is constructed.

Specified by:

initialize in class FileSystem

Parameters:

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

conf - the configuration

Throws:

IOException

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

openConnection

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

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

Parameters:

path - The path component of the URL

query - The query component of the URL

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

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:

IOException

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

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

setWorkingDirectory

public void setWorkingDirectory(Path f)

Description copied from class: FileSystem

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

Specified by:

setWorkingDirectory in class FileSystem

append

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

This optional operation is not yet supported.

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,
                                 FsPermission permission,
                                 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

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

Throws:

IOException

delete

@Deprecated
public boolean delete(Path f)
               throws IOException

Deprecated.

Specified by:

delete in class FileSystem

Throws:

IOException

delete

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

Description copied from class: FileSystem

Delete a file.

Specified by:

delete in class FileSystem

Parameters:

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.

Returns:

true if delete is successful else false.

Throws:

IOException

mkdirs

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

Description copied from class: 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.

Specified by:

mkdirs in class FileSystem

Throws:

IOException