ViewFileSystem (Apache Hadoop Main 3.0.0-alpha2-SNAPSHOT API)

java.lang.Object
- org.apache.hadoop.conf.Configured
- - org.apache.hadoop.fs.FileSystem
  - - org.apache.hadoop.fs.viewfs.ViewFileSystem

すべての実装されたインタフェース:

Closeable, AutoCloseable, Configurable
```
@InterfaceAudience.Public
 @InterfaceStability.Evolving
public class ViewFileSystem
extends FileSystem
```
ViewFileSystem (extends the FileSystem interface) implements a client-side mount table. Its spec and implementation is identical to ViewFs.

フィールドのサマリー
- クラスから継承されたフィールド org.apache.hadoop.fs.FileSystem
  DEFAULT_FS, FS_DEFAULT_NAME_KEY, LOG, SHUTDOWN_HOOK_PRIORITY, statistics, TRASH_PREFIX

コンストラクタのサマリー

コンストラクタ
コンストラクタと説明
`ViewFileSystem()` This is the constructor with the signature needed by `FileSystem.createFileSystem(URI, Configuration)` After this constructor is called initialize() is called.
`ViewFileSystem(Configuration conf)` Convenience Constructor for apps to call directly

メソッドのサマリー

すべてのメソッドインスタンス・メソッド concreteメソッド
修飾子とタイプ	メソッドと説明
`void`	`access(Path path, FsAction mode)` Checks if the user can access a path.
`FSDataOutputStream`	`append(Path f, int bufferSize, Progressable progress)` Append to an existing file (optional operation).
`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, EnumSet<CreateFlag> flags, int bufferSize, short replication, long blockSize, Progressable progress)` Opens an FSDataOutputStream at the indicated Path with write-progress reporting.
`Path`	`createSnapshot(Path path, String snapshotName)` Create a snapshot
`boolean`	`delete(Path f)` Delete a file
`boolean`	`delete(Path f, boolean recursive)` Delete a file.
`void`	`deleteSnapshot(Path path, String snapshotName)` Delete a snapshot of a directory
`AclStatus`	`getAclStatus(Path path)` Gets the ACL of a file or directory.
`Collection<? extends BlockStoragePolicySpi>`	`getAllStoragePolicies()` Retrieve all the storage policies supported by this file system.
`FileSystem[]`	`getChildFileSystems()` Get all the immediate child FileSystems embedded in this FileSystem.
`ContentSummary`	`getContentSummary(Path f)` Return the `ContentSummary` of a given `Path`.
`long`	`getDefaultBlockSize()` Return the number of bytes that large input files should be optimally be split into to minimize i/o time.
`long`	`getDefaultBlockSize(Path f)` 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.
`short`	`getDefaultReplication(Path f)` Get the default replication for a path.
`BlockLocation[]`	`getFileBlockLocations(FileStatus fs, 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)` Return a file status object that represents the path.
`Path`	`getHomeDirectory()` Return the current user's home directory in this filesystem.
`org.apache.hadoop.fs.viewfs.ViewFileSystem.MountPoint[]`	`getMountPoints()`
`QuotaUsage`	`getQuotaUsage(Path f)` Return the `QuotaUsage` of a given `Path`.
`String`	`getScheme()` Return the protocol scheme for the FileSystem.
`FsServerDefaults`	`getServerDefaults()` Return a set of server default configuration values
`FsServerDefaults`	`getServerDefaults(Path f)` Return a set of server default configuration values
`BlockStoragePolicySpi`	`getStoragePolicy(Path src)` Query the effective storage policy ID for the given file or directory.
`Path`	`getTrashCanLocation(Path f)`
`URI`	`getUri()` Returns a URI whose scheme and authority identify this FileSystem.
`Path`	`getWorkingDirectory()` Get the current working directory for the given file system
`byte[]`	`getXAttr(Path path, String name)` Get an xattr name and value for a file or directory.
`Map<String,byte[]>`	`getXAttrs(Path path)` Get all of the xattr name/value pairs for a file or directory.
`Map<String,byte[]>`	`getXAttrs(Path path, List<String> names)` Get all of the xattrs name/value pairs for a file or directory.
`void`	`initialize(URI theUri, Configuration conf)` Called after a new FileSystem instance is constructed.
`org.apache.hadoop.fs.RemoteIterator<LocatedFileStatus>`	`listLocatedStatus(Path f, PathFilter filter)` Listing a directory The returned results include its block location if it is a file The results are filtered by the given path filter
`FileStatus[]`	`listStatus(Path f)` List the statuses of the files/directories in the given path if the path is a directory.
`List<String>`	`listXAttrs(Path path)` Get all of the xattr names for a file or directory.
`boolean`	`mkdirs(Path dir, FsPermission permission)` Make the given file and all non-existent parents into directories.
`void`	`modifyAclEntries(Path path, List<AclEntry> aclSpec)` Modifies ACL entries of files and directories.
`FSDataInputStream`	`open(Path f, int bufferSize)` Opens an FSDataInputStream at the indicated Path.
`void`	`removeAcl(Path path)` Removes all but the base ACL entries of files and directories.
`void`	`removeAclEntries(Path path, List<AclEntry> aclSpec)` Removes ACL entries from files and directories.
`void`	`removeDefaultAcl(Path path)` Removes all default ACL entries from files and directories.
`void`	`removeXAttr(Path path, String name)` Remove an xattr of a file or directory.
`boolean`	`rename(Path src, Path dst)` Renames Path src to Path dst.
`void`	`renameSnapshot(Path path, String snapshotOldName, String snapshotNewName)` Rename a snapshot
`Path`	`resolvePath(Path f)` Return the fully-qualified path of path f resolving the path through any symlinks or mount point
`void`	`setAcl(Path path, List<AclEntry> aclSpec)` Fully replaces ACL of files and directories, discarding all existing entries.
`void`	`setOwner(Path f, String username, String groupname)` Set owner of a path (i.e. a file or a directory).
`void`	`setPermission(Path f, FsPermission permission)` Set permission of a path.
`boolean`	`setReplication(Path f, short replication)` Set replication for an existing file.
`void`	`setStoragePolicy(Path src, String policyName)` Set the storage policy for a given file or directory.
`void`	`setTimes(Path f, long mtime, long atime)` Set access time of a file
`void`	`setVerifyChecksum(boolean verifyChecksum)` Set the verify checksum flag.
`void`	`setWorkingDirectory(Path new_dir)` Set the current working directory for the given file system.
`void`	`setWriteChecksum(boolean writeChecksum)` Set the write checksum flag.
`void`	`setXAttr(Path path, String name, byte[] value, EnumSet<XAttrSetFlag> flag)` Set an xattr of a file or directory.
`boolean`	`truncate(Path f, long newLength)` Truncate the file in the indicated path to the indicated size.
`void`	`unsetStoragePolicy(Path src)` Unset the storage policy set for a given file or directory.

クラスから継承されたメソッド org.apache.hadoop.fs.FileSystem
append, append, areSymlinksEnabled, cancelDeleteOnExit, canonicalizeUri, checkPath, clearStatistics, close, closeAll, closeAllForUGI, completeLocalOutput, concat, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, create, create, createNewFile, createNonRecursive, createNonRecursive, createSnapshot, createSymlink, deleteOnExit, enableSymlinks, exists, fixRelativePart, get, get, get, getAllStatistics, getBlockSize, getCanonicalUri, getDefaultPort, getDefaultUri, getFileBlockLocations, getFileChecksum, getFileLinkStatus, getFileSystemClass, getFSofPath, getGlobalStorageStatistics, getInitialWorkingDirectory, getLength, getLinkTarget, getLocal, getName, getNamed, getReplication, getStatistics, getStatistics, getStatus, getStatus, getStorageStatistics, getTrashRoot, getTrashRoots, getUsed, getUsed, globStatus, globStatus, isDirectory, isFile, listCorruptFileBlocks, listFiles, listLocatedStatus, listStatus, listStatus, listStatus, listStatusIterator, makeQualified, mkdirs, mkdirs, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, newInstance, newInstance, newInstance, newInstanceLocal, open, primitiveCreate, primitiveMkdir, primitiveMkdir, printStatistics, processDeleteOnExit, rename, resolveLink, setDefaultUri, setDefaultUri, setXAttr, startLocalOutput, supportsSymlinks

クラスから継承されたメソッド org.apache.hadoop.conf.Configured
getConf, setConf

クラスから継承されたメソッド java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- コンストラクタの詳細
  - ViewFileSystem
```
public ViewFileSystem()
               throws IOException
```
    This is the constructor with the signature needed by FileSystem.createFileSystem(URI, Configuration) After this constructor is called initialize() is called.
    
    例外:
    
    IOException
  - ViewFileSystem
```
public ViewFileSystem(Configuration conf)
               throws IOException
```
    Convenience Constructor for apps to call directly
    
    パラメータ:
    
    conf -
    
    例外:
    
    IOException
- メソッドの詳細
  - getScheme
```
public String getScheme()
```
    Return the protocol scheme for the FileSystem.
    
    オーバーライド:
    
    getScheme クラス内 FileSystem
    
    戻り値:
    
    viewfs
  - initialize
```
public void initialize(URI theUri,
                       Configuration conf)
                throws IOException
```
    Called after a new FileSystem instance is constructed.
    
    オーバーライド:
    
    initialize クラス内 FileSystem
    
    パラメータ:
    
    theUri - a uri whose authority section names the host, port, etc. for this FileSystem
    
    conf - the configuration
    
    例外:
    
    IOException
  - getTrashCanLocation
```
public Path getTrashCanLocation(Path f)
                         throws FileNotFoundException
```
    例外:
    
    FileNotFoundException
  - getUri
```
public URI getUri()
```
    クラスからコピーされた説明: FileSystem
    
    Returns a URI whose scheme and authority identify this FileSystem.
    
    定義:
    
    getUri クラス内 FileSystem
  - resolvePath
```
public Path resolvePath(Path f)
                 throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Return the fully-qualified path of path f resolving the path through any symlinks or mount point
    
    オーバーライド:
    
    resolvePath クラス内 FileSystem
    
    パラメータ:
    
    f - path to be resolved
    
    戻り値:
    
    fully qualified path
    
    例外:
    
    FileNotFoundException
    
    IOException
  - getHomeDirectory
```
public Path getHomeDirectory()
```
    クラスからコピーされた説明: FileSystem
    
    Return the current user's home directory in this filesystem. The default implementation returns "/user/$USER/".
    
    オーバーライド:
    
    getHomeDirectory クラス内 FileSystem
  - getWorkingDirectory
```
public Path getWorkingDirectory()
```
    クラスからコピーされた説明: FileSystem
    
    Get the current working directory for the given file system
    
    定義:
    
    getWorkingDirectory クラス内 FileSystem
    
    戻り値:
    
    the directory pathname
  - setWorkingDirectory
```
public void setWorkingDirectory(Path new_dir)
```
    クラスからコピーされた説明: FileSystem
    
    Set the current working directory for the given file system. All relative paths will be resolved relative to it.
    
    定義:
    
    setWorkingDirectory クラス内 FileSystem
    
    パラメータ:
    
    new_dir - Path of new working directory
  - append
```
public FSDataOutputStream append(Path f,
                                 int bufferSize,
                                 Progressable progress)
                          throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Append to an existing file (optional operation).
    
    定義:
    
    append クラス内 FileSystem
    
    パラメータ:
    
    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.
    
    例外:
    
    IOException
  - createNonRecursive
```
public FSDataOutputStream createNonRecursive(Path f,
                                             FsPermission permission,
                                             EnumSet<CreateFlag> flags,
                                             int bufferSize,
                                             short replication,
                                             long blockSize,
                                             Progressable progress)
                                      throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Opens an FSDataOutputStream at the indicated Path with write-progress reporting. Same as create(), except fails if parent directory doesn't already exist.
    
    オーバーライド:
    
    createNonRecursive クラス内 FileSystem
    
    パラメータ:
    
    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
    
    例外:
    
    IOException
    
    関連項目:
    
    FileSystem.setPermission(Path, FsPermission)
  - create
```
public FSDataOutputStream create(Path f,
                                 FsPermission permission,
                                 boolean overwrite,
                                 int bufferSize,
                                 short replication,
                                 long blockSize,
                                 Progressable progress)
                          throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Create an FSDataOutputStream at the indicated Path with write-progress reporting.
    
    定義:
    
    create クラス内 FileSystem
    
    パラメータ:
    
    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
    
    例外:
    
    IOException
    
    関連項目:
    
    FileSystem.setPermission(Path, FsPermission)
  - delete
```
public boolean delete(Path f,
                      boolean recursive)
               throws org.apache.hadoop.security.AccessControlException,
                      FileNotFoundException,
                      IOException
```
    クラスからコピーされた説明: FileSystem
    
    Delete a file.
    
    定義:
    
    delete クラス内 FileSystem
    
    パラメータ:
    
    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.
    
    戻り値:
    
    true if delete is successful else false.
    
    例外:
    
    IOException
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
  - delete
```
public boolean delete(Path f)
               throws org.apache.hadoop.security.AccessControlException,
                      FileNotFoundException,
                      IOException
```
    クラスからコピーされた説明: FileSystem
    
    Delete a file
    
    オーバーライド:
    
    delete クラス内 FileSystem
    
    例外:
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
    
    IOException
  - getFileBlockLocations
```
public BlockLocation[] getFileBlockLocations(FileStatus fs,
                                             long start,
                                             long len)
                                      throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Return an array containing hostnames, offset and size of portions of the given file. For a nonexistent file or regions, null will be returned. This call is most helpful with DFS, where it returns hostnames of machines that contain the given file. The FileSystem will simply return an elt containing 'localhost'.
    
    オーバーライド:
    
    getFileBlockLocations クラス内 FileSystem
    
    パラメータ:
    
    fs - FilesStatus to get data from
    
    start - offset into the given file
    
    len - length for which to get locations for
    
    例外:
    
    IOException
  - getFileChecksum
```
public FileChecksum getFileChecksum(Path f)
                             throws org.apache.hadoop.security.AccessControlException,
                                    FileNotFoundException,
                                    IOException
```
    クラスからコピーされた説明: FileSystem
    
    Get the checksum of a file.
    
    オーバーライド:
    
    getFileChecksum クラス内 FileSystem
    
    パラメータ:
    
    f - The file path
    
    戻り値:
    
    The file checksum. The default return value is null, which indicates that no checksum algorithm is implemented in the corresponding FileSystem.
    
    例外:
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
    
    IOException
  - getFileStatus
```
public FileStatus getFileStatus(Path f)
                         throws org.apache.hadoop.security.AccessControlException,
                                FileNotFoundException,
                                IOException
```
    クラスからコピーされた説明: FileSystem
    
    Return a file status object that represents the path.
    
    定義:
    
    getFileStatus クラス内 FileSystem
    
    パラメータ:
    
    f - The path we want information from
    
    戻り値:
    
    a FileStatus object
    
    例外:
    
    FileNotFoundException - when the path does not exist; IOException see specific implementation
    
    org.apache.hadoop.security.AccessControlException
    
    IOException
  - access
```
public void access(Path path,
                   FsAction mode)
            throws org.apache.hadoop.security.AccessControlException,
                   FileNotFoundException,
                   IOException
```
    クラスからコピーされた説明: FileSystem
    
    Checks if the user can access a path. The mode specifies which access checks to perform. If the requested permissions are granted, then the method returns normally. If access is denied, then the method throws an AccessControlException.
    The default implementation of this method calls FileSystem.getFileStatus(Path) and checks the returned permissions against the requested permissions. Note that the getFileStatus call will be subject to authorization checks. Typically, this requires search (execute) permissions on each directory in the path's prefix, but this is implementation-defined. Any file system that provides a richer authorization model (such as ACLs) may override the default implementation so that it checks against that model instead.
    In general, applications should avoid using this method, due to the risk of time-of-check/time-of-use race conditions. The permissions on a file may change immediately after the access call returns. Most applications should prefer running specific file system actions as the desired user represented by a UserGroupInformation.
    
    パラメータ:
    
    path - Path to check
    
    mode - type of access to check
    
    例外:
    
    org.apache.hadoop.security.AccessControlException - if access is denied
    
    FileNotFoundException - if the path does not exist
    
    IOException - see specific implementation
  - listStatus
```
public FileStatus[] listStatus(Path f)
                        throws org.apache.hadoop.security.AccessControlException,
                               FileNotFoundException,
                               IOException
```
    クラスからコピーされた説明: 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.
    
    定義:
    
    listStatus クラス内 FileSystem
    
    パラメータ:
    
    f - given path
    
    戻り値:
    
    the statuses of the files/directories in the given patch
    
    例外:
    
    FileNotFoundException - when the path does not exist; IOException see specific implementation
    
    org.apache.hadoop.security.AccessControlException
    
    IOException
  - listLocatedStatus
```
public org.apache.hadoop.fs.RemoteIterator<LocatedFileStatus> listLocatedStatus(Path f,
                                                                                PathFilter filter)
                                                                         throws FileNotFoundException,
                                                                                IOException
```
    クラスからコピーされた説明: FileSystem
    
    Listing a directory The returned results include its block location if it is a file The results are filtered by the given path filter
    
    オーバーライド:
    
    listLocatedStatus クラス内 FileSystem
    
    パラメータ:
    
    f - a path
    
    filter - a path filter
    
    戻り値:
    
    an iterator that traverses statuses of the files/directories in the given path
    
    例外:
    
    FileNotFoundException - if f does not exist
    
    IOException - if any I/O error occurred
  - mkdirs
```
public boolean mkdirs(Path dir,
                      FsPermission permission)
               throws IOException
```
    クラスからコピーされた説明: 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.
    
    定義:
    
    mkdirs クラス内 FileSystem
    
    パラメータ:
    
    dir - path to create
    
    permission - to apply to f
    
    例外:
    
    IOException
  - open
```
public FSDataInputStream open(Path f,
                              int bufferSize)
                       throws org.apache.hadoop.security.AccessControlException,
                              FileNotFoundException,
                              IOException
```
    クラスからコピーされた説明: FileSystem
    
    Opens an FSDataInputStream at the indicated Path.
    
    定義:
    
    open クラス内 FileSystem
    
    パラメータ:
    
    f - the file name to open
    
    bufferSize - the size of the buffer to be used.
    
    例外:
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
    
    IOException
  - rename
```
public boolean rename(Path src,
                      Path dst)
               throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Renames Path src to Path dst. Can take place on local fs or remote DFS.
    
    定義:
    
    rename クラス内 FileSystem
    
    パラメータ:
    
    src - path to be renamed
    
    dst - new path after rename
    
    戻り値:
    
    true if rename is successful
    
    例外:
    
    IOException - on failure
  - truncate
```
public boolean truncate(Path f,
                        long newLength)
                 throws IOException
```
    クラスからコピーされた説明: 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.
    オーバーライド:
    
    truncate クラス内 FileSystem
    
    パラメータ:
    
    f - The path to the file to be truncated
    
    newLength - The size the file is to be truncated to
    
    戻り値:
    
    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.
    
    例外:
    
    IOException
  - setOwner
```
public void setOwner(Path f,
                     String username,
                     String groupname)
              throws org.apache.hadoop.security.AccessControlException,
                     FileNotFoundException,
                     IOException
```
    クラスからコピーされた説明: FileSystem
    
    Set owner of a path (i.e. a file or a directory). The parameters username and groupname cannot both be null.
    
    オーバーライド:
    
    setOwner クラス内 FileSystem
    
    パラメータ:
    
    f - The path
    
    username - If it is null, the original username remains unchanged.
    
    groupname - If it is null, the original groupname remains unchanged.
    
    例外:
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
    
    IOException
  - setPermission
```
public void setPermission(Path f,
                          FsPermission permission)
                   throws org.apache.hadoop.security.AccessControlException,
                          FileNotFoundException,
                          IOException
```
    クラスからコピーされた説明: FileSystem
    
    Set permission of a path.
    
    オーバーライド:
    
    setPermission クラス内 FileSystem
    
    パラメータ:
    
    f - The path
    
    permission - permission
    
    例外:
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
    
    IOException
  - setReplication
```
public boolean setReplication(Path f,
                              short replication)
                       throws org.apache.hadoop.security.AccessControlException,
                              FileNotFoundException,
                              IOException
```
    クラスからコピーされた説明: FileSystem
    
    Set replication for an existing file.
    
    オーバーライド:
    
    setReplication クラス内 FileSystem
    
    パラメータ:
    
    f - file name
    
    replication - new replication
    
    戻り値:
    
    true if successful; false if file does not exist or is a directory
    
    例外:
    
    IOException
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
  - setTimes
```
public void setTimes(Path f,
                     long mtime,
                     long atime)
              throws org.apache.hadoop.security.AccessControlException,
                     FileNotFoundException,
                     IOException
```
    クラスからコピーされた説明: FileSystem
    
    Set access time of a file
    
    オーバーライド:
    
    setTimes クラス内 FileSystem
    
    パラメータ:
    
    f - The path
    
    mtime - Set the modification time of this file. The number of milliseconds since Jan 1, 1970. A value of -1 means that this call should not set modification time.
    
    atime - Set the access time of this file. The number of milliseconds since Jan 1, 1970. A value of -1 means that this call should not set access time.
    
    例外:
    
    org.apache.hadoop.security.AccessControlException
    
    FileNotFoundException
    
    IOException
  - modifyAclEntries
```
public void modifyAclEntries(Path path,
                             List<AclEntry> aclSpec)
                      throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Modifies ACL entries of files and directories. This method can add new ACL entries or modify the permissions on existing ACL entries. All existing ACL entries that are not specified in this call are retained without changes. (Modifications are merged into the current ACL.)
    
    オーバーライド:
    
    modifyAclEntries クラス内 FileSystem
    
    パラメータ:
    
    path - Path to modify
    
    aclSpec - List describing modifications
    
    例外:
    
    IOException - if an ACL could not be modified
  - removeAclEntries
```
public void removeAclEntries(Path path,
                             List<AclEntry> aclSpec)
                      throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Removes ACL entries from files and directories. Other ACL entries are retained.
    
    オーバーライド:
    
    removeAclEntries クラス内 FileSystem
    
    パラメータ:
    
    path - Path to modify
    
    aclSpec - List describing entries to remove
    
    例外:
    
    IOException - if an ACL could not be modified
  - removeDefaultAcl
```
public void removeDefaultAcl(Path path)
                      throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Removes all default ACL entries from files and directories.
    
    オーバーライド:
    
    removeDefaultAcl クラス内 FileSystem
    
    パラメータ:
    
    path - Path to modify
    
    例外:
    
    IOException - if an ACL could not be modified
  - removeAcl
```
public void removeAcl(Path path)
               throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Removes all but the base ACL entries of files and directories. The entries for user, group, and others are retained for compatibility with permission bits.
    
    オーバーライド:
    
    removeAcl クラス内 FileSystem
    
    パラメータ:
    
    path - Path to modify
    
    例外:
    
    IOException - if an ACL could not be removed
  - setAcl
```
public void setAcl(Path path,
                   List<AclEntry> aclSpec)
            throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Fully replaces ACL of files and directories, discarding all existing entries.
    
    オーバーライド:
    
    setAcl クラス内 FileSystem
    
    パラメータ:
    
    path - Path to modify
    
    aclSpec - List describing modifications, must include entries for user, group, and others for compatibility with permission bits.
    
    例外:
    
    IOException - if an ACL could not be modified
  - getAclStatus
```
public AclStatus getAclStatus(Path path)
                       throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Gets the ACL of a file or directory.
    
    オーバーライド:
    
    getAclStatus クラス内 FileSystem
    
    パラメータ:
    
    path - Path to get
    
    戻り値:
    
    AclStatus describing the ACL of the file or directory
    
    例外:
    
    IOException - if an ACL could not be read
  - setXAttr
```
public void setXAttr(Path path,
                     String name,
                     byte[] value,
                     EnumSet<XAttrSetFlag> flag)
              throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Set an xattr of a file or directory. The name must be prefixed with the namespace followed by ".". For example, "user.attr".
    Refer to the HDFS extended attributes user documentation for details.
    
    オーバーライド:
    
    setXAttr クラス内 FileSystem
    
    パラメータ:
    
    path - Path to modify
    
    name - xattr name.
    
    value - xattr value.
    
    flag - xattr set flag
    
    例外:
    
    IOException
  - getXAttr
```
public byte[] getXAttr(Path path,
                       String name)
                throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Get an xattr name and value for a file or directory. The name must be prefixed with the namespace followed by ".". For example, "user.attr".
    Refer to the HDFS extended attributes user documentation for details.
    
    オーバーライド:
    
    getXAttr クラス内 FileSystem
    
    パラメータ:
    
    path - Path to get extended attribute
    
    name - xattr name.
    
    戻り値:
    
    byte[] xattr value.
    
    例外:
    
    IOException
  - getXAttrs
```
public Map<String,byte[]> getXAttrs(Path path)
                             throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Get all of the xattr name/value pairs for a file or directory. Only those xattrs which the logged-in user has permissions to view are returned.
    Refer to the HDFS extended attributes user documentation for details.
    
    オーバーライド:
    
    getXAttrs クラス内 FileSystem
    
    パラメータ:
    
    path - Path to get extended attributes
    
    戻り値:
    
    Map describing the XAttrs of the file or directory
    
    例外:
    
    IOException
  - getXAttrs
```
public Map<String,byte[]> getXAttrs(Path path,
                                    List<String> names)
                             throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Get all of the xattrs name/value pairs for a file or directory. Only those xattrs which the logged-in user has permissions to view are returned.
    Refer to the HDFS extended attributes user documentation for details.
    
    オーバーライド:
    
    getXAttrs クラス内 FileSystem
    
    パラメータ:
    
    path - Path to get extended attributes
    
    names - XAttr names.
    
    戻り値:
    
    Map describing the XAttrs of the file or directory
    
    例外:
    
    IOException
  - listXAttrs
```
public List<String> listXAttrs(Path path)
                        throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Get all of the xattr names for a file or directory. Only those xattr names which the logged-in user has permissions to view are returned.
    Refer to the HDFS extended attributes user documentation for details.
    
    オーバーライド:
    
    listXAttrs クラス内 FileSystem
    
    パラメータ:
    
    path - Path to get extended attributes
    
    戻り値:
    
    List of the XAttr names of the file or directory
    
    例外:
    
    IOException
  - removeXAttr
```
public void removeXAttr(Path path,
                        String name)
                 throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Remove an xattr of a file or directory. The name must be prefixed with the namespace followed by ".". For example, "user.attr".
    Refer to the HDFS extended attributes user documentation for details.
    
    オーバーライド:
    
    removeXAttr クラス内 FileSystem
    
    パラメータ:
    
    path - Path to remove extended attribute
    
    name - xattr name
    
    例外:
    
    IOException
  - setVerifyChecksum
```
public void setVerifyChecksum(boolean verifyChecksum)
```
    クラスからコピーされた説明: FileSystem
    
    Set the verify checksum flag. This is only applicable if the corresponding FileSystem supports checksum. By default doesn't do anything.
    
    オーバーライド:
    
    setVerifyChecksum クラス内 FileSystem
    
    パラメータ:
    
    verifyChecksum - Verify checksum flag
  - getDefaultBlockSize
```
public long getDefaultBlockSize()
```
    クラスからコピーされた説明: FileSystem
    
    Return the number of bytes that large input files should be optimally be split into to minimize i/o time.
    
    オーバーライド:
    
    getDefaultBlockSize クラス内 FileSystem
  - getDefaultReplication
```
public short getDefaultReplication()
```
    クラスからコピーされた説明: FileSystem
    
    Get the default replication.
    
    オーバーライド:
    
    getDefaultReplication クラス内 FileSystem
  - getServerDefaults
```
public FsServerDefaults getServerDefaults()
                                   throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Return a set of server default configuration values
    
    オーバーライド:
    
    getServerDefaults クラス内 FileSystem
    
    戻り値:
    
    server default configuration values
    
    例外:
    
    IOException
  - getDefaultBlockSize
```
public long getDefaultBlockSize(Path f)
```
    クラスからコピーされた説明: FileSystem
    
    Return the number of bytes that large input files should be optimally be split into to minimize i/o time. The given path will be used to locate the actual filesystem. The full path does not have to exist.
    
    オーバーライド:
    
    getDefaultBlockSize クラス内 FileSystem
    
    パラメータ:
    
    f - path of file
    
    戻り値:
    
    the default block size for the path's filesystem
  - getDefaultReplication
```
public short getDefaultReplication(Path f)
```
    クラスからコピーされた説明: FileSystem
    
    Get the default replication for a path. The given path will be used to locate the actual filesystem. The full path does not have to exist.
    
    オーバーライド:
    
    getDefaultReplication クラス内 FileSystem
    
    パラメータ:
    
    f - of the file
    
    戻り値:
    
    default replication for the path's filesystem
  - getServerDefaults
```
public FsServerDefaults getServerDefaults(Path f)
                                   throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Return a set of server default configuration values
    
    オーバーライド:
    
    getServerDefaults クラス内 FileSystem
    
    パラメータ:
    
    f - path is used to identify an FS since an FS could have another FS that it could be delegating the call to
    
    戻り値:
    
    server default configuration values
    
    例外:
    
    IOException
  - getContentSummary
```
public ContentSummary getContentSummary(Path f)
                                 throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Return the ContentSummary of a given Path.
    
    オーバーライド:
    
    getContentSummary クラス内 FileSystem
    
    パラメータ:
    
    f - path to use
    
    例外:
    
    IOException
  - getQuotaUsage
```
public QuotaUsage getQuotaUsage(Path f)
                         throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Return the QuotaUsage of a given Path.
    
    オーバーライド:
    
    getQuotaUsage クラス内 FileSystem
    
    パラメータ:
    
    f - path to use
    
    例外:
    
    IOException
  - setWriteChecksum
```
public void setWriteChecksum(boolean writeChecksum)
```
    クラスからコピーされた説明: FileSystem
    
    Set the write checksum flag. This is only applicable if the corresponding FileSystem supports checksum. By default doesn't do anything.
    
    オーバーライド:
    
    setWriteChecksum クラス内 FileSystem
    
    パラメータ:
    
    writeChecksum - Write checsum flag
  - getChildFileSystems
```
public FileSystem[] getChildFileSystems()
```
    クラスからコピーされた説明: FileSystem
    
    Get all the immediate child FileSystems embedded in this FileSystem. It does not recurse and get grand children. If a FileSystem has multiple child FileSystems, then it should return a unique list of those FileSystems. Default is to return null to signify no children.
    
    戻り値:
    
    FileSystems used by this FileSystem
  - getMountPoints
```
public org.apache.hadoop.fs.viewfs.ViewFileSystem.MountPoint[] getMountPoints()
```
  - createSnapshot
```
public Path createSnapshot(Path path,
                           String snapshotName)
                    throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Create a snapshot
    
    オーバーライド:
    
    createSnapshot クラス内 FileSystem
    
    パラメータ:
    
    path - The directory where snapshots will be taken.
    
    snapshotName - The name of the snapshot
    
    戻り値:
    
    the snapshot path.
    
    例外:
    
    IOException
  - renameSnapshot
```
public void renameSnapshot(Path path,
                           String snapshotOldName,
                           String snapshotNewName)
                    throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Rename a snapshot
    
    オーバーライド:
    
    renameSnapshot クラス内 FileSystem
    
    パラメータ:
    
    path - The directory path where the snapshot was taken
    
    snapshotOldName - Old name of the snapshot
    
    snapshotNewName - New name of the snapshot
    
    例外:
    
    IOException
  - deleteSnapshot
```
public void deleteSnapshot(Path path,
                           String snapshotName)
                    throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Delete a snapshot of a directory
    
    オーバーライド:
    
    deleteSnapshot クラス内 FileSystem
    
    パラメータ:
    
    path - The directory that the to-be-deleted snapshot belongs to
    
    snapshotName - The name of the snapshot
    
    例外:
    
    IOException
  - setStoragePolicy
```
public void setStoragePolicy(Path src,
                             String policyName)
                      throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Set the storage policy for a given file or directory.
    
    オーバーライド:
    
    setStoragePolicy クラス内 FileSystem
    
    パラメータ:
    
    src - file or directory path.
    
    policyName - the name of the target storage policy. The list of supported Storage policies can be retrieved via FileSystem.getAllStoragePolicies().
    
    例外:
    
    IOException
  - unsetStoragePolicy
```
public void unsetStoragePolicy(Path src)
                        throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Unset the storage policy set for a given file or directory.
    
    オーバーライド:
    
    unsetStoragePolicy クラス内 FileSystem
    
    パラメータ:
    
    src - file or directory path.
    
    例外:
    
    IOException
  - getStoragePolicy
```
public BlockStoragePolicySpi getStoragePolicy(Path src)
                                       throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Query the effective storage policy ID for the given file or directory.
    
    オーバーライド:
    
    getStoragePolicy クラス内 FileSystem
    
    パラメータ:
    
    src - file or directory path.
    
    戻り値:
    
    storage policy for give file.
    
    例外:
    
    IOException
  - getAllStoragePolicies
```
public Collection<? extends BlockStoragePolicySpi> getAllStoragePolicies()
                                                                  throws IOException
```
    クラスからコピーされた説明: FileSystem
    
    Retrieve all the storage policies supported by this file system.
    
    オーバーライド:
    
    getAllStoragePolicies クラス内 FileSystem
    
    戻り値:
    
    all storage policies supported by this filesystem.
    
    例外:
    
    IOException

クラス ViewFileSystem

フィールドのサマリー

クラスから継承されたフィールド org.apache.hadoop.fs.FileSystem

コンストラクタのサマリー

メソッドのサマリー

クラスから継承されたメソッド org.apache.hadoop.fs.FileSystem

クラスから継承されたメソッド org.apache.hadoop.conf.Configured

クラスから継承されたメソッド java.lang.Object

コンストラクタの詳細

ViewFileSystem

ViewFileSystem

メソッドの詳細

getScheme

initialize

getTrashCanLocation

getUri

resolvePath

getHomeDirectory

getWorkingDirectory

setWorkingDirectory

append

createNonRecursive

create

delete

delete

getFileBlockLocations

getFileChecksum

getFileStatus

access

listStatus

listLocatedStatus

mkdirs

open

rename

truncate

setOwner

setPermission

setReplication

setTimes

modifyAclEntries

removeAclEntries

removeDefaultAcl

removeAcl

setAcl

getAclStatus

setXAttr

getXAttr

getXAttrs

getXAttrs

listXAttrs

removeXAttr

setVerifyChecksum

getDefaultBlockSize

getDefaultReplication

getServerDefaults

getDefaultBlockSize

getDefaultReplication

getServerDefaults

getContentSummary

getQuotaUsage

setWriteChecksum

getChildFileSystems

getMountPoints

createSnapshot

renameSnapshot

deleteSnapshot

setStoragePolicy

unsetStoragePolicy

getStoragePolicy

getAllStoragePolicies