RawLocalFileSystem (Apache Hadoop Main 2.9.2 API)

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_FS, FS_DEFAULT_NAME_KEY, SHUTDOWN_HOOK_PRIORITY, statistics, TRASH_PREFIX, USER_HOME_PREFIX

Constructor Summary

Constructors
Constructor and Description

RawLocalFileSystem()

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()` Close this FileSystem instance.
`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.
`FSDataOutputStream`	`createNonRecursive(Path f, FsPermission permission, EnumSet<CreateFlag> flags, int bufferSize, short replication, long blockSize, Progressable progress)` Opens an FSDataOutputStream at the indicated Path with write-progress reporting.
`protected OutputStream`	`createOutputStream(Path f, boolean append)`
`protected OutputStream`	`createOutputStreamWithMode(Path f, boolean append, FsPermission permission)`
`void`	`createSymlink(Path target, Path link, boolean createParent)` See `FileContext.createSymlink(Path, Path, boolean)`.
`boolean`	`delete(Path p, boolean recursive)` Delete the given path to a file or directory.
`FileStatus`	`getFileLinkStatus(Path f)` Return a FileStatus representing the given path.
`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 FileContext class, getWorkingDirectory() will be removed.
`Path`	`getLinkTarget(Path f)` See `FileContext.getLinkTarget(Path)`.
`FsStatus`	`getStatus(Path p)` Returns a status object describing the use and capacity of the filesystem.
`URI`	`getUri()` Returns a URI which identifies this FileSystem.
`Path`	`getWorkingDirectory()` Get the current working directory for the given FileSystem
`boolean`	`handleEmptyDstDirectoryOnWindows(Path src, File srcFile, Path dst, File dstFile)`
`void`	`initialize(URI uri, Configuration conf)` Initialize a FileSystem.
`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.
`protected boolean`	`mkOneDir(File p2f)`
`protected boolean`	`mkOneDirWithMode(Path p, File p2f, FsPermission permission)`
`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.
`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`	`setTimes(Path p, long mtime, long atime)` Sets the `Path`'s last modified time and last access time to the given valid times.
`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.
`boolean`	`supportsSymlinks()` See `AbstractFileSystem.supportsSymlinks()`.
`String`	`toString()`
`boolean`	`truncate(Path f, long newLength)` Truncate the file in the indicated path to the indicated size.
`static void`	`useStatIfAvailable()`

Methods inherited from class org.apache.hadoop.fs.FileSystem
addDelegationTokens, append, append, appendFile, areSymlinksEnabled, cancelDeleteOnExit, canonicalizeUri, checkPath, clearStatistics, closeAll, closeAllForUGI, concat, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, create, createFile, createNewFile, createNonRecursive, createSnapshot, createSnapshot, delete, deleteOnExit, deleteSnapshot, enableSymlinks, exists, fixRelativePart, get, get, get, getAclStatus, getAllStatistics, getAllStoragePolicies, getBlockSize, getCanonicalServiceName, getCanonicalUri, getContentSummary, getDefaultBlockSize, getDefaultBlockSize, getDefaultPort, getDefaultReplication, getDefaultReplication, getDefaultUri, getFileBlockLocations, getFileBlockLocations, getFileChecksum, getFileChecksum, getFileSystemClass, getFSofPath, getGlobalStorageStatistics, getLength, getLocal, getName, getNamed, getQuotaUsage, getReplication, getScheme, getServerDefaults, getServerDefaults, getStatistics, getStatistics, getStatus, getStoragePolicy, getStorageStatistics, getTrashRoot, getTrashRoots, getUsed, getUsed, getXAttr, getXAttrs, getXAttrs, globStatus, globStatus, isDirectory, isFile, listCorruptFileBlocks, listFiles, listLocatedStatus, listLocatedStatus, listStatus, listStatus, listStatus, listStatusIterator, listXAttrs, makeQualified, mkdirs, modifyAclEntries, moveFromLocalFile, moveToLocalFile, newInstance, newInstance, newInstance, newInstanceLocal, open, primitiveCreate, primitiveMkdir, primitiveMkdir, printStatistics, processDeleteOnExit, removeAcl, removeAclEntries, removeDefaultAcl, removeXAttr, rename, renameSnapshot, resolveLink, resolvePath, setAcl, setDefaultUri, setDefaultUri, setReplication, setStoragePolicy, setVerifyChecksum, setWriteChecksum, setXAttr, setXAttr, unsetStoragePolicy

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
  - useStatIfAvailable
```
public static void useStatIfAvailable()
```
  - pathToFile
```
public File pathToFile(Path path)
```
    Convert a path to a File.
  - getUri
```
public URI getUri()
```
    Description copied from class: FileSystem
    
    Returns a URI which identifies this FileSystem.
    
    Specified by:
    
    getUri in class FileSystem
    
    Returns:
    the URI of this filesystem.
  - initialize
```
public void initialize(URI uri,
              Configuration conf)
                throws IOException
```
    Description copied from class: FileSystem
    
    Initialize a FileSystem. Called after the new FileSystem instance is constructed, and before it is ready for use. FileSystem implementations overriding this method MUST forward it to their superclass, though the order in which it is done, and whether to alter the configuration before the invocation are options of the subclass.
    
    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 - on any failure to initialize this instance.
  - 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 - IO failure
  - append
```
public FSDataOutputStream append(Path f,
                        int bufferSize,
                        Progressable progress)
                          throws IOException
```
    Description copied from class: FileSystem
    
    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 - IO failure
  - create
```
public FSDataOutputStream create(Path f,
                        boolean overwrite,
                        int bufferSize,
                        short replication,
                        long blockSize,
                        Progressable progress)
                          throws IOException
```
    Description copied from class: FileSystem
    
    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 - IO failure
  - createOutputStream
```
protected OutputStream createOutputStream(Path f,
                              boolean append)
                                   throws IOException
```
    Throws:
    
    IOException
  - createOutputStreamWithMode
```
protected OutputStream createOutputStreamWithMode(Path f,
                                      boolean append,
                                      FsPermission permission)
                                           throws IOException
```
    Throws:
    
    IOException
  - createNonRecursive
```
public FSDataOutputStream createNonRecursive(Path f,
                                    FsPermission permission,
                                    EnumSet<CreateFlag> flags,
                                    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. Same as create(), except fails if parent directory doesn't already exist.
    
    Overrides:
    
    createNonRecursive in class FileSystem
    
    Parameters:
    f - the file name to open
    permission - file permission
    flags - CreateFlags to use for this stream.
    bufferSize - the size of the buffer to be used.
    replication - required block replication for the file.
    blockSize - block size
    progress - the progress reporter
    
    Throws:
    
    IOException - IO failure
    See Also:
    FileSystem.setPermission(Path, FsPermission)
  - 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
    
    Create an FSDataOutputStream at the indicated Path with write-progress reporting.
    
    Specified by:
    
    create in class FileSystem
    
    Parameters:
    f - the file name to open
    permission - file permission
    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.
    blockSize - block size
    progress - the progress reporter
    
    Throws:
    
    IOException - IO failure
    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
```
    Description copied from class: FileSystem
    
    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
    permission - file permission
    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.
    blockSize - block size
    progress - the progress reporter
    
    Throws:
    
    IOException - IO failure
    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.
    
    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
  - handleEmptyDstDirectoryOnWindows
```
public final boolean handleEmptyDstDirectoryOnWindows(Path src,
                                       File srcFile,
                                       Path dst,
                                       File dstFile)
                                               throws IOException
```
    Throws:
    
    IOException
  - truncate
```
public boolean truncate(Path f,
               long newLength)
                 throws IOException
```
    Description copied from class: FileSystem
    Truncate the file in the indicated path to the indicated size.
    - Fails if path is a directory.
    - Fails if path does not exist.
    - Fails if path is not closed.
    - Fails if new size is greater than current size.
    Overrides:
    
    truncate in class FileSystem
    
    Parameters:
    f - The path to the file to be truncated
    newLength - The size the file is to be truncated to
    
    Returns:
    true if the file has been truncated to the desired newLength and is immediately available to be reused for write operations such as append, or false if a background process of adjusting the length of the last block has been started, and clients should wait for it to complete before proceeding with further file updates.
    
    Throws:
    
    IOException - IO 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.
    Does not guarantee to return the List of files/directories status in a sorted order.
    
    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
  - mkOneDir
```
protected boolean mkOneDir(File p2f)
                    throws IOException
```
    Throws:
    
    IOException
  - mkOneDirWithMode
```
protected boolean mkOneDirWithMode(Path p,
                       File p2f,
                       FsPermission permission)
                            throws IOException
```
    Throws:
    
    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
    
    Parameters:
    f - path
    
    Returns:
    true if the directory was created
    
    Throws:
    
    IOException - IO failure
  - 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 roughly the semantics of Unix @{code 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 - IO failure
  - 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
    
    Parameters:
    newDir - Path of new working directory
  - getWorkingDirectory
```
public Path getWorkingDirectory()
```
    Description copied from class: FileSystem
    
    Get the current working directory for the given FileSystem
    
    Specified by:
    
    getWorkingDirectory in class FileSystem
    
    Returns:
    the directory pathname
  - getInitialWorkingDirectory
```
protected Path getInitialWorkingDirectory()
```
    Description copied from class: FileSystem
    
    Note: with the new FileContext class, getWorkingDirectory() will be removed. The working directory is implemented in FileContext. Some FileSystems 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 initial 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
```
    Description copied from class: FileSystem
    
    Returns a status object describing the use and capacity of the filesystem. If the filesystem 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 the filesystem at the given dst name, removing the source afterwards.
    
    Overrides:
    
    moveFromLocalFile in class FileSystem
    
    Parameters:
    src - local path
    dst - path
    
    Throws:
    
    IOException - IO failure
  - 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 target name in this FileSystem and the local working file path. If this FileSystem is local, we write directly into the target. If the FileSystem is not local, 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 - IO failure
  - 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 - IO failure
  - close
```
public void close()
           throws IOException
```
    Description copied from class: FileSystem
    
    Close this FileSystem instance. Will release any held locks, delete all files queued for deletion through calls to FileSystem.deleteOnExit(Path), and remove this FS instance from the cache, if cached. After this operation, the outcome of any method call on this FileSystem instance, or any input/output stream created by it is undefined.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Overrides:
    
    close in class FileSystem
    
    Throws:
    
    IOException - IO failure
  - 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
  - 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 - IO failure
  - setPermission
```
public void setPermission(Path p,
                 FsPermission permission)
                   throws IOException
```
    Use the command chmod to set permission.
    
    Overrides:
    
    setPermission in class FileSystem
    
    Parameters:
    p - The path
    permission - permission
    
    Throws:
    
    IOException - IO failure
  - setTimes
```
public void setTimes(Path p,
            long mtime,
            long atime)
              throws IOException
```
    Sets the Path's last modified time and last access time to the given valid times.
    
    Overrides:
    
    setTimes in class FileSystem
    
    Parameters:
    mtime - the modification time to set (only if no less than zero).
    atime - the access time to set (only if no less than zero).
    p - The path
    
    Throws:
    
    IOException - if setting the times fails.
  - supportsSymlinks
```
public boolean supportsSymlinks()
```
    Description copied from class: FileSystem
    
    See AbstractFileSystem.supportsSymlinks().
    
    Overrides:
    
    supportsSymlinks in class FileSystem
  - 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 FileSystem
    
    Throws:
    
    IOException
  - getFileLinkStatus
```
public FileStatus getFileLinkStatus(Path f)
                             throws IOException
```
    Return a FileStatus representing the given path. If the path refers to a symlink return a FileStatus representing the link rather than the object the link refers to.
    
    Overrides:
    
    getFileLinkStatus in class FileSystem
    
    Throws:
    
    FileNotFoundException - when the path does not exist
    
    IOException - see specific implementation
  - getLinkTarget
```
public Path getLinkTarget(Path f)
                   throws IOException
```
    Description copied from class: FileSystem
    
    See FileContext.getLinkTarget(Path).
    
    Overrides:
    
    getLinkTarget in class FileSystem
    
    Throws:
    
    IOException

Class RawLocalFileSystem

Field Summary

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

Constructor Summary

Method Summary

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

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

Methods inherited from class java.lang.Object

Constructor Detail

RawLocalFileSystem

Method Detail

useStatIfAvailable

pathToFile

getUri

initialize

open

append

create

createOutputStream

createOutputStreamWithMode

createNonRecursive

create

createNonRecursive

rename

handleEmptyDstDirectoryOnWindows

truncate

delete

listStatus

mkOneDir

mkOneDirWithMode

mkdirs

mkdirs

getHomeDirectory

setWorkingDirectory

getWorkingDirectory

getInitialWorkingDirectory

getStatus

moveFromLocalFile

startLocalOutput

completeLocalOutput

close

toString

getFileStatus

setOwner

setPermission

setTimes

supportsSymlinks

createSymlink

getFileLinkStatus

getLinkTarget