org.apache.hadoop.fs

Class LocalFileSystem

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FileSystem

org.apache.hadoop.fs.FilterFileSystem

org.apache.hadoop.fs.ChecksumFileSystem

org.apache.hadoop.fs.LocalFileSystem

All Implemented Interfaces:

Closeable, AutoCloseable, Configurable, org.apache.hadoop.fs.PathCapabilities, org.apache.hadoop.security.token.DelegationTokenIssuer

@InterfaceAudience.Public
 @InterfaceStability.Stable
public class LocalFileSystem
extends ChecksumFileSystem

Implement the FileSystem API for the checksumed local filesystem.

Field Summary

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

fs, swapScheme

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

DEFAULT_FS, FS_DEFAULT_NAME_KEY, SHUTDOWN_HOOK_PRIORITY, statistics, TRASH_PREFIX, USER_HOME_PREFIX

Constructor Summary

Constructors

Constructor and Description
LocalFileSystem()
LocalFileSystem(FileSystem rawLocalFileSystem)

Method Summary

Modifier and Type	Method and Description
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.
void	createSymlink(Path target, Path link, boolean createParent) See FileContext.createSymlink(Path, Path, boolean).
FileStatus	getFileLinkStatus(Path f) See FileContext.getFileLinkStatus(Path).
Path	getLinkTarget(Path f) See FileContext.getLinkTarget(Path).
FileSystem	getRaw()
String	getScheme() Return the protocol scheme for the FileSystem.
void	initialize(URI name, Configuration conf) Called after a new FileSystem instance is constructed.
File	pathToFile(Path path) Convert a path to a File.
boolean	reportChecksumFailure(Path p, FSDataInputStream in, long inPos, FSDataInputStream sums, long sumsPos) Moves files to a bad file directory on the same device, so that their storage will not be reused.
boolean	supportsSymlinks() See AbstractFileSystem.supportsSymlinks().

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

append, appendFile, completeLocalOutput, concat, copyToLocalFile, create, create, createFile, createNonRecursive, createNonRecursive, delete, getApproxChkSumLength, getBytesPerSum, getChecksumFile, getChecksumFileLength, getChecksumLength, getRawFileSystem, hasPathCapability, isChecksumFile, listLocatedStatus, listStatus, listStatusIterator, mkdirs, modifyAclEntries, open, openFile, openFileWithOptions, removeAcl, removeAclEntries, removeDefaultAcl, rename, setAcl, setConf, setOwner, setPermission, setReplication, setVerifyChecksum, setWriteChecksum, startLocalOutput, truncate

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

access, canonicalizeUri, checkPath, close, copyFromLocalFile, copyFromLocalFile, createPathHandle, createSnapshot, deleteSnapshot, getAclStatus, getAllStoragePolicies, getCanonicalUri, getChildFileSystems, getConf, getDefaultBlockSize, getDefaultBlockSize, getDefaultReplication, getDefaultReplication, getFileBlockLocations, getFileChecksum, getFileChecksum, getFileStatus, getHomeDirectory, getInitialWorkingDirectory, getServerDefaults, getServerDefaults, getStatus, getStoragePolicy, getTrashRoot, getTrashRoots, getUri, getUsed, getUsed, getWorkingDirectory, getXAttr, getXAttrs, getXAttrs, listCorruptFileBlocks, listLocatedStatus, listXAttrs, makeQualified, mkdirs, msync, open, openFile, openFileWithOptions, primitiveCreate, primitiveMkdir, removeXAttr, rename, renameSnapshot, resolveLink, resolvePath, satisfyStoragePolicy, setStoragePolicy, setTimes, setWorkingDirectory, setXAttr, setXAttr, unsetStoragePolicy

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

append, append, append, append, areSymlinksEnabled, cancelDeleteOnExit, clearStatistics, closeAll, closeAllForUGI, copyFromLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, create, createDataOutputStreamBuilder, createMultipartUploader, createNewFile, createNonRecursive, createSnapshot, delete, deleteOnExit, enableSymlinks, exists, fixRelativePart, get, get, get, getAllStatistics, getBlockSize, getCanonicalServiceName, getContentSummary, getDefaultPort, getDefaultUri, getFileBlockLocations, getFileSystemClass, getFSofPath, getGlobalStorageStatistics, getLength, getLocal, getName, getNamed, getPathHandle, getQuotaUsage, getReplication, getStatistics, getStatistics, getStatus, getStorageStatistics, globStatus, globStatus, isDirectory, isFile, listFiles, listStatus, listStatus, listStatus, mkdirs, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, newInstance, newInstance, newInstance, newInstanceLocal, open, open, primitiveMkdir, printStatistics, processDeleteOnExit, setDefaultUri, setDefaultUri, setQuota, setQuotaByStorageType

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.security.token.DelegationTokenIssuer

addDelegationTokens, getAdditionalTokenIssuers, getDelegationToken

Constructor Detail

LocalFileSystem

public LocalFileSystem()

LocalFileSystem

public LocalFileSystem(FileSystem rawLocalFileSystem)

Method Detail

initialize

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

Description copied from class: FilterFileSystem

Called after a new FileSystem instance is constructed.

Overrides:

initialize in class FilterFileSystem

Parameters:

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

conf - the configuration

Throws:

IOException - on any failure to initialize this instance.

getScheme

public String getScheme()

Return the protocol scheme for the FileSystem.

Overrides:

getScheme in class FileSystem

Returns:

file

getRaw

public FileSystem getRaw()

pathToFile

public File pathToFile(Path path)

Convert a path to a File.

Parameters:

path - the path.

Returns:

file.

copyFromLocalFile

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

Description copied from class: FilterFileSystem

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

Overrides:

copyFromLocalFile in class ChecksumFileSystem

Parameters:

delSrc - whether to delete the src

src - path

dst - path

Throws:

IOException - IO failure.

copyToLocalFile

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

Description copied from class: ChecksumFileSystem

The src file is under FS, and the dst is on the local disk. Copy it from FS control to the local dst name.

Overrides:

copyToLocalFile in class ChecksumFileSystem

Parameters:

delSrc - whether to delete the src

src - path src file in the remote filesystem

dst - path local destination

Throws:

IOException - IO failure

reportChecksumFailure

public boolean reportChecksumFailure(Path p,
                                     FSDataInputStream in,
                                     long inPos,
                                     FSDataInputStream sums,
                                     long sumsPos)

Moves files to a bad file directory on the same device, so that their storage will not be reused.

Overrides:

reportChecksumFailure in class ChecksumFileSystem

Parameters:

p - the file name containing the error

in - the stream open on the file

inPos - the position of the beginning of the bad data in the file

sums - the stream open on the checksum file

sumsPos - the position of the beginning of the bad data in the checksum file

Returns:

if retry is necessary

supportsSymlinks

public boolean supportsSymlinks()

Description copied from class: FileSystem

See AbstractFileSystem.supportsSymlinks().

Overrides:

supportsSymlinks in class FilterFileSystem

Returns:

if support symlinkls true, not false.

createSymlink

public void createSymlink(Path target,
                          Path link,
                          boolean createParent)
                   throws IOException

Description copied from class: FileSystem

See FileContext.createSymlink(Path, Path, boolean).

Overrides:

createSymlink in class FilterFileSystem

Parameters:

target - target path.

link - link.

createParent - create parent.

Throws:

AccessControlException - if access is denied.

FileAlreadyExistsException - when the path does not exist.

FileNotFoundException - when the path does not exist.

ParentNotDirectoryException - if the parent path of dest is not a directory.

UnsupportedFileSystemException - if there was no known implementation for the scheme.

IOException - raised on errors performing I/O.

getFileLinkStatus

public FileStatus getFileLinkStatus(Path f)
                             throws IOException

Description copied from class: FileSystem

See FileContext.getFileLinkStatus(Path).

Overrides:

getFileLinkStatus in class FilterFileSystem

Parameters:

f - the path.

Returns:

file status

Throws:

AccessControlException - if access is denied.

FileNotFoundException - when the path does not exist.

IOException - raised on errors performing I/O.

UnsupportedFileSystemException - if there was no known implementation for the scheme.

getLinkTarget

public Path getLinkTarget(Path f)
                   throws IOException

Description copied from class: FileSystem

See FileContext.getLinkTarget(Path).

Overrides:

getLinkTarget in class FilterFileSystem

Parameters:

f - the path.

Returns:

the path.

Throws:

IOException - IO failure.