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java.lang.Objectorg.apache.hadoop.conf.Configured
org.apache.hadoop.fs.FileSystem
org.apache.hadoop.fs.FilterFileSystem
public class FilterFileSystem
A FilterFileSystem contains
some other file system, which it uses as
its basic file system, possibly transforming
the data along the way or providing additional
functionality. The class FilterFileSystem
itself simply overrides all methods of
FileSystem with versions that
pass all requests to the contained file
system. Subclasses of FilterFileSystem
may further override some of these methods
and may also provide additional methods
and fields.
| Nested Class Summary |
|---|
| Nested classes/interfaces inherited from class org.apache.hadoop.fs.FileSystem |
|---|
FileSystem.Statistics |
| Field Summary | |
|---|---|
protected FileSystem |
fs
|
| Fields inherited from class org.apache.hadoop.fs.FileSystem |
|---|
FS_DEFAULT_NAME_KEY, LOG, statistics |
| Constructor Summary | |
|---|---|
FilterFileSystem()
|
|
FilterFileSystem(FileSystem fs)
|
|
| Method Summary | |
|---|---|
FSDataOutputStream |
append(Path f,
int bufferSize,
Progressable progress)
Append to an existing file (optional operation). |
protected void |
checkPath(Path path)
Check that a Path belongs to this FileSystem. |
void |
close()
No more filesystem operations are needed. |
void |
completeLocalOutput(Path fsOutputFile,
Path tmpLocalFile)
Called when we're all done writing to the target. |
void |
concat(Path f,
Path[] psrcs)
Concat existing files together. |
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,
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 |
String |
getCanonicalServiceName()
Get a canonical service name for this file system. |
Configuration |
getConf()
Return the configuration used by this object. |
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 an array containing hostnames, offset and size of portions of the given file. |
FileChecksum |
getFileChecksum(Path f)
Get the checksum of a file. |
FileStatus |
getFileStatus(Path f)
Get file status. |
Path |
getHomeDirectory()
Return the current user's home directory in this filesystem. |
String |
getName()
Deprecated. call #getUri() instead. |
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 files in a directory. |
Path |
makeQualified(Path path)
Make sure that a path specifies a FileSystem. |
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. |
boolean |
rename(Path src,
Path dst)
Renames Path src to Path dst. |
void |
setOwner(Path p,
String username,
String groupname)
Set owner of a path (i.e. |
void |
setPermission(Path p,
FsPermission permission)
Set permission of a path. |
boolean |
setReplication(Path src,
short replication)
Set replication for an existing file. |
void |
setVerifyChecksum(boolean verifyChecksum)
Set the verify checksum flag. |
void |
setWorkingDirectory(Path newDir)
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. |
| Methods inherited from class org.apache.hadoop.conf.Configured |
|---|
setConf |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
protected FileSystem fs
| Constructor Detail |
|---|
public FilterFileSystem()
public FilterFileSystem(FileSystem fs)
| Method Detail |
|---|
public void initialize(URI name,
Configuration conf)
throws IOException
initialize in class FileSystemname - a uri whose authority section names the host, port, etc.
for this FileSystemconf - the configuration
IOExceptionpublic URI getUri()
getUri in class FileSystempublic String getCanonicalServiceName()
FileSystem
getCanonicalServiceName in class FileSystemSecurityUtil.buildDTServiceName(URI, int)public String getName()
getName in class FileSystempublic Path makeQualified(Path path)
makeQualified in class FileSystemprotected void checkPath(Path path)
checkPath in class FileSystem
public BlockLocation[] getFileBlockLocations(FileStatus file,
long start,
long len)
throws IOException
FileSystem
getFileBlockLocations in class FileSystemIOException
public FSDataInputStream open(Path f,
int bufferSize)
throws IOException
open in class FileSystemf - the file name to openbufferSize - the size of the buffer to be used.
IOException
public FSDataOutputStream append(Path f,
int bufferSize,
Progressable progress)
throws IOException
append in class FileSystemf - the existing file to be appended.bufferSize - the size of the buffer to be used.progress - for reporting progress if it is not null.
IOException
public void concat(Path f,
Path[] psrcs)
throws IOException
FileSystem
concat in class FileSystemf - the path to the target destination.
IOException
public FSDataOutputStream create(Path f,
FsPermission permission,
boolean overwrite,
int bufferSize,
short replication,
long blockSize,
Progressable progress)
throws IOException
FileSystem
create in class FileSystemf - the file name to openoverwrite - 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.
IOExceptionFileSystem.setPermission(Path, FsPermission)
public boolean setReplication(Path src,
short replication)
throws IOException
setReplication in class FileSystemsrc - file namereplication - new replication
IOException
public boolean rename(Path src,
Path dst)
throws IOException
rename in class FileSystemIOException
@Deprecated
public boolean delete(Path f)
throws IOException
delete in class FileSystemIOException
public boolean delete(Path f,
boolean recursive)
throws IOException
delete in class FileSystemf - 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.
IOException
public FileStatus[] listStatus(Path f)
throws IOException
listStatus in class FileSystemf - given path
IOExceptionpublic Path getHomeDirectory()
FileSystem
getHomeDirectory in class FileSystempublic void setWorkingDirectory(Path newDir)
setWorkingDirectory in class FileSystemnewDir - public Path getWorkingDirectory()
getWorkingDirectory in class FileSystem
public boolean mkdirs(Path f,
FsPermission permission)
throws IOException
mkdirs in class FileSystemIOException
public void copyFromLocalFile(boolean delSrc,
Path src,
Path dst)
throws IOException
copyFromLocalFile in class FileSystemIOException
public void copyToLocalFile(boolean delSrc,
Path src,
Path dst)
throws IOException
copyToLocalFile in class FileSystemIOException
public Path startLocalOutput(Path fsOutputFile,
Path tmpLocalFile)
throws IOException
startLocalOutput in class FileSystemIOException
public void completeLocalOutput(Path fsOutputFile,
Path tmpLocalFile)
throws IOException
completeLocalOutput in class FileSystemIOExceptionpublic long getDefaultBlockSize()
getDefaultBlockSize in class FileSystempublic short getDefaultReplication()
getDefaultReplication in class FileSystem
public FileStatus getFileStatus(Path f)
throws IOException
getFileStatus in class FileSystemf - The path we want information from
FileNotFoundException - when the path does not exist;
IOException see specific implementation
IOException
public FileChecksum getFileChecksum(Path f)
throws IOException
getFileChecksum in class FileSystemf - The file path
IOExceptionpublic void setVerifyChecksum(boolean verifyChecksum)
setVerifyChecksum in class FileSystempublic Configuration getConf()
Configurable
getConf in interface ConfigurablegetConf in class Configured
public void close()
throws IOException
FileSystem
close in interface Closeableclose in class FileSystemIOException
public void setOwner(Path p,
String username,
String groupname)
throws IOException
setOwner in class FileSystemp - The pathusername - If it is null, the original username remains unchanged.groupname - If it is null, the original groupname remains unchanged.
IOException
public void setPermission(Path p,
FsPermission permission)
throws IOException
setPermission in class FileSystemIOException
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