org.apache.hadoop.fs.viewfs

クラス ViewFs

java.lang.Object

org.apache.hadoop.fs.AbstractFileSystem

org.apache.hadoop.fs.viewfs.ViewFs

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public class ViewFs
extends AbstractFileSystem

ViewFs (extends the AbstractFileSystem interface) implements a client-side mount table. The viewFs file system is implemented completely in memory on the client side. The client-side mount table allows a client to provide a customized view of a file system namespace that is composed from one or more individual file systems (a localFs or Hdfs, S3fs, etc). For example one could have a mount table that provides links such as

• /user -> hdfs://nnContainingUserDir/user
• /project/foo -> hdfs://nnProject1/projects/foo
• /project/bar -> hdfs://nnProject2/projects/bar
• /tmp -> hdfs://nnTmp/privateTmpForUserXXX

ViewFs is specified with the following URI: viewfs:///

To use viewfs one would typically set the default file system in the config (i.e. fs.default.name< = viewfs:///) along with the mount table config variables as described below.

** Config variables to specify the mount table entries **

The file system is initialized from the standard Hadoop config through config variables. See FsConstants for URI and Scheme constants; See Constants for config var constants; see ConfigUtil for convenient lib.

All the mount table config entries for view fs are prefixed by fs.viewfs.mounttable. For example the above example can be specified with the following config variables:

• fs.viewfs.mounttable.default.link./user= hdfs://nnContainingUserDir/user
• fs.viewfs.mounttable.default.link./project/foo= hdfs://nnProject1/projects/foo
• fs.viewfs.mounttable.default.link./project/bar= hdfs://nnProject2/projects/bar
• fs.viewfs.mounttable.default.link./tmp= hdfs://nnTmp/privateTmpForUserXXX

The default mount table (when no authority is specified) is from config variables prefixed by fs.viewFs.mounttable.default The authority component of a URI can be used to specify a different mount table. For example,

• viewfs://sanjayMountable/

is initialized from fs.viewFs.mounttable.sanjayMountable.* config variables.

**** Merge Mounts **** (NOTE: merge mounts are not implemented yet.)

One can also use "MergeMounts" to merge several directories (this is sometimes called union-mounts or junction-mounts in the literature. For example of the home directories are stored on say two file systems (because they do not fit on one) then one could specify a mount entry such as following merges two dirs:

• /user -> hdfs://nnUser1/user,hdfs://nnUser2/user

Such a mergeLink can be specified with the following config var where "," is used as the separator for each of links to be merged:

• fs.viewfs.mounttable.default.linkMerge./user= hdfs://nnUser1/user,hdfs://nnUser1/user

A special case of the merge mount is where mount table's root is merged with the root (slash) of another file system:

• fs.viewfs.mounttable.default.linkMergeSlash=hdfs://nn99/

In this cases the root of the mount table is merged with the root of hdfs://nn99/

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.AbstractFileSystem

statistics

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
ViewFs(Configuration conf)

メソッドのサマリー

修飾子とタイプ	メソッドと説明
void	access(Path path, FsAction mode) The specification of this method matches that of FileContext.access(Path, FsAction) except that an UnresolvedLinkException may be thrown if a symlink is encountered in the path.
FSDataOutputStream	createInternal(Path f, EnumSet<CreateFlag> flag, FsPermission absolutePermission, int bufferSize, short replication, long blockSize, Progressable progress, org.apache.hadoop.fs.Options.ChecksumOpt checksumOpt, boolean createParent) The specification of this method matches that of AbstractFileSystem.create(Path, EnumSet, Options.CreateOpts...) except that the opts have been declared explicitly.
Path	createSnapshot(Path path, String snapshotName) The specification of this method matches that of FileContext.createSnapshot(Path, String).
void	createSymlink(Path target, Path link, boolean createParent) The specification of this method matches that of FileContext.createSymlink(Path, Path, boolean);
boolean	delete(Path f, boolean recursive) The specification of this method matches that of FileContext.delete(Path, boolean) except that Path f must be for this file system.
void	deleteSnapshot(Path path, String snapshotName) The specification of this method matches that of FileContext.deleteSnapshot(Path, String).
AclStatus	getAclStatus(Path path) Gets the ACLs of files and directories.
List<Token<?>>	getDelegationTokens(String renewer) Get one or more delegation tokens associated with the filesystem.
BlockLocation[]	getFileBlockLocations(Path f, long start, long len) The specification of this method matches that of FileContext.getFileBlockLocations(Path, long, long) except that Path f must be for this file system.
FileChecksum	getFileChecksum(Path f) The specification of this method matches that of FileContext.getFileChecksum(Path) except that Path f must be for this file system.
FileStatus	getFileLinkStatus(Path f) The specification of this method matches that of FileContext.getFileLinkStatus(Path) except that an UnresolvedLinkException may be thrown if a symlink is encountered in the path leading up to the final path component.
FileStatus	getFileStatus(Path f) The specification of this method matches that of FileContext.getFileStatus(Path) except that an UnresolvedLinkException may be thrown if a symlink is encountered in the path.
FsStatus	getFsStatus() The specification of this method matches that of FileContext.getFsStatus(Path).
Path	getHomeDirectory() Return the current user's home directory in this file system.
Path	getLinkTarget(Path f) Partially resolves the path.
org.apache.hadoop.fs.viewfs.ViewFs.MountPoint[]	getMountPoints()
FsServerDefaults	getServerDefaults() Return a set of server default configuration values.
BlockStoragePolicySpi	getStoragePolicy(Path src) Retrieve the storage policy for a given file or directory.
int	getUriDefaultPort() The default port of this file system.
byte[]	getXAttr(Path path, String name) Get an xattr for a file or directory.
Map<String,byte[]>	getXAttrs(Path path) Get all of the xattrs for a file or directory.
Map<String,byte[]>	getXAttrs(Path path, List<String> names) Get all of the xattrs for a file or directory.
boolean	isValidName(String src) Returns true if the specified string is considered valid in the path part of a URI by this file system.
FileStatus[]	listStatus(Path f) The specification of this method matches that of FileContext.Util.listStatus(Path) except that Path f must be for this file system.
org.apache.hadoop.fs.RemoteIterator<FileStatus>	listStatusIterator(Path f) The specification of this method matches that of FileContext.listStatus(Path) except that Path f must be for this file system.
List<String>	listXAttrs(Path path) Get all of the xattr names for a file or directory.
void	mkdir(Path dir, FsPermission permission, boolean createParent) The specification of this method matches that of FileContext.mkdir(Path, FsPermission, boolean) except that the Path f must be fully qualified and the permission is absolute (i.e.
void	modifyAclEntries(Path path, List<AclEntry> aclSpec) Modifies ACL entries of files and directories.
FSDataInputStream	open(Path f, int bufferSize) The specification of this method matches that of FileContext.open(Path, int) except that Path f must be for this file system.
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.
void	renameInternal(Path src, Path dst) The specification of this method matches that of FileContext.rename(Path, Path, Options.Rename...) except that Path f must be for this file system and NO OVERWRITE is performed.
void	renameInternal(Path src, Path dst, boolean overwrite) The specification of this method matches that of FileContext.rename(Path, Path, Options.Rename...) except that Path f must be for this file system.
void	renameSnapshot(Path path, String snapshotOldName, String snapshotNewName) The specification of this method matches that of FileContext.renameSnapshot(Path, String, String).
Path	resolvePath(Path f) Return the fully-qualified path of path f resolving the path through any internal 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) The specification of this method matches that of FileContext.setOwner(Path, String, String) except that Path f must be for this file system.
void	setPermission(Path f, FsPermission permission) The specification of this method matches that of FileContext.setPermission(Path, FsPermission) except that Path f must be for this file system.
boolean	setReplication(Path f, short replication) The specification of this method matches that of FileContext.setReplication(Path, short) except that Path f must be for this file system.
void	setStoragePolicy(Path path, String policyName) Set the storage policy for a given file or directory.
void	setTimes(Path f, long mtime, long atime) The specification of this method matches that of FileContext.setTimes(Path, long, long) except that Path f must be for this file system.
void	setVerifyChecksum(boolean verifyChecksum) The specification of this method matches that of FileContext.setVerifyChecksum(boolean, Path) except that Path f must be for this file system.
void	setXAttr(Path path, String name, byte[] value, EnumSet<XAttrSetFlag> flag) Set an xattr of a file or directory.
boolean	supportsSymlinks() Returns true if the file system supports symlinks, false otherwise.
boolean	truncate(Path f, long newLength) The specification of this method matches that of FileContext.truncate(Path, long) except that Path f must be for this file system.
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.AbstractFileSystem

checkPath, checkScheme, clearStatistics, create, createFileSystem, equals, get, getAllStatistics, getAllStoragePolicies, getCanonicalServiceName, getFsStatus, getInitialWorkingDirectory, getStatistics, getStatistics, getUri, getUriPath, hashCode, listCorruptFileBlocks, listLocatedStatus, makeQualified, open, printStatistics, rename, setXAttr

クラスから継承されたメソッド java.lang.Object

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

コンストラクタの詳細

ViewFs

public ViewFs(Configuration conf)
       throws IOException,
              URISyntaxException

例外:

IOException

URISyntaxException

メソッドの詳細

getServerDefaults

public FsServerDefaults getServerDefaults()
                                   throws IOException

クラスからコピーされた説明: AbstractFileSystem

Return a set of server default configuration values.

定義:

getServerDefaults クラス内 AbstractFileSystem

戻り値:

server default configuration values

例外:

IOException - an I/O error occurred

getUriDefaultPort

public int getUriDefaultPort()

クラスからコピーされた説明: AbstractFileSystem

The default port of this file system.

定義:

getUriDefaultPort クラス内 AbstractFileSystem

戻り値:

default port of this file system's Uri scheme A uri with a port of -1 => default port;

getHomeDirectory

public Path getHomeDirectory()

クラスからコピーされた説明: AbstractFileSystem

Return the current user's home directory in this file system. The default implementation returns "/user/$USER/".

オーバーライド:

getHomeDirectory クラス内 AbstractFileSystem

戻り値:

current user's home directory.

resolvePath

public Path resolvePath(Path f)
                 throws FileNotFoundException,
                        org.apache.hadoop.security.AccessControlException,
                        org.apache.hadoop.fs.UnresolvedLinkException,
                        IOException

クラスからコピーされた説明: AbstractFileSystem

Return the fully-qualified path of path f resolving the path through any internal symlinks or mount point

オーバーライド:

resolvePath クラス内 AbstractFileSystem

パラメータ:

f - path to be resolved

戻り値:

fully qualified path

例外:

FileNotFoundException

org.apache.hadoop.security.AccessControlException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

createInternal

public FSDataOutputStream createInternal(Path f,
                                         EnumSet<CreateFlag> flag,
                                         FsPermission absolutePermission,
                                         int bufferSize,
                                         short replication,
                                         long blockSize,
                                         Progressable progress,
                                         org.apache.hadoop.fs.Options.ChecksumOpt checksumOpt,
                                         boolean createParent)
                                  throws org.apache.hadoop.security.AccessControlException,
                                         FileAlreadyExistsException,
                                         FileNotFoundException,
                                         ParentNotDirectoryException,
                                         UnsupportedFileSystemException,
                                         org.apache.hadoop.fs.UnresolvedLinkException,
                                         IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of AbstractFileSystem.create(Path, EnumSet, Options.CreateOpts...) except that the opts have been declared explicitly.

定義:

createInternal クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileAlreadyExistsException

FileNotFoundException

ParentNotDirectoryException

UnsupportedFileSystemException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

delete

public boolean delete(Path f,
                      boolean recursive)
               throws org.apache.hadoop.security.AccessControlException,
                      FileNotFoundException,
                      org.apache.hadoop.fs.UnresolvedLinkException,
                      IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.delete(Path, boolean) except that Path f must be for this file system.

定義:

delete クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

getFileBlockLocations

public BlockLocation[] getFileBlockLocations(Path f,
                                             long start,
                                             long len)
                                      throws org.apache.hadoop.security.AccessControlException,
                                             FileNotFoundException,
                                             org.apache.hadoop.fs.UnresolvedLinkException,
                                             IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.getFileBlockLocations(Path, long, long) except that Path f must be for this file system.

定義:

getFileBlockLocations クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

getFileChecksum

public FileChecksum getFileChecksum(Path f)
                             throws org.apache.hadoop.security.AccessControlException,
                                    FileNotFoundException,
                                    org.apache.hadoop.fs.UnresolvedLinkException,
                                    IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.getFileChecksum(Path) except that Path f must be for this file system.

定義:

getFileChecksum クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

getFileStatus

public FileStatus getFileStatus(Path f)
                         throws org.apache.hadoop.security.AccessControlException,
                                FileNotFoundException,
                                org.apache.hadoop.fs.UnresolvedLinkException,
                                IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.getFileStatus(Path) except that an UnresolvedLinkException may be thrown if a symlink is encountered in the path.

定義:

getFileStatus クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

access

public void access(Path path,
                   FsAction mode)
            throws org.apache.hadoop.security.AccessControlException,
                   FileNotFoundException,
                   org.apache.hadoop.fs.UnresolvedLinkException,
                   IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.access(Path, FsAction) except that an UnresolvedLinkException may be thrown if a symlink is encountered in the path.

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

getFileLinkStatus

public FileStatus getFileLinkStatus(Path f)
                             throws org.apache.hadoop.security.AccessControlException,
                                    FileNotFoundException,
                                    UnsupportedFileSystemException,
                                    IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.getFileLinkStatus(Path) except that an UnresolvedLinkException may be thrown if a symlink is encountered in the path leading up to the final path component. If the file system does not support symlinks then the behavior is equivalent to AbstractFileSystem.getFileStatus(Path).

オーバーライド:

getFileLinkStatus クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

UnsupportedFileSystemException

IOException

getFsStatus

public FsStatus getFsStatus()
                     throws org.apache.hadoop.security.AccessControlException,
                            FileNotFoundException,
                            IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.getFsStatus(Path).

定義:

getFsStatus クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

IOException

listStatusIterator

public org.apache.hadoop.fs.RemoteIterator<FileStatus> listStatusIterator(Path f)
                                                                   throws org.apache.hadoop.security.AccessControlException,
                                                                          FileNotFoundException,
                                                                          org.apache.hadoop.fs.UnresolvedLinkException,
                                                                          IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.listStatus(Path) except that Path f must be for this file system.

オーバーライド:

listStatusIterator クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

listStatus

public FileStatus[] listStatus(Path f)
                        throws org.apache.hadoop.security.AccessControlException,
                               FileNotFoundException,
                               org.apache.hadoop.fs.UnresolvedLinkException,
                               IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.Util.listStatus(Path) except that Path f must be for this file system.

定義:

listStatus クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

mkdir

public void mkdir(Path dir,
                  FsPermission permission,
                  boolean createParent)
           throws org.apache.hadoop.security.AccessControlException,
                  FileAlreadyExistsException,
                  FileNotFoundException,
                  org.apache.hadoop.fs.UnresolvedLinkException,
                  IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.mkdir(Path, FsPermission, boolean) except that the Path f must be fully qualified and the permission is absolute (i.e. umask has been applied).

定義:

mkdir クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileAlreadyExistsException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

open

public FSDataInputStream open(Path f,
                              int bufferSize)
                       throws org.apache.hadoop.security.AccessControlException,
                              FileNotFoundException,
                              org.apache.hadoop.fs.UnresolvedLinkException,
                              IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.open(Path, int) except that Path f must be for this file system.

定義:

open クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

truncate

public boolean truncate(Path f,
                        long newLength)
                 throws org.apache.hadoop.security.AccessControlException,
                        FileNotFoundException,
                        org.apache.hadoop.fs.UnresolvedLinkException,
                        IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.truncate(Path, long) except that Path f must be for this file system.

オーバーライド:

truncate クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

renameInternal

public void renameInternal(Path src,
                           Path dst,
                           boolean overwrite)
                    throws IOException,
                           org.apache.hadoop.fs.UnresolvedLinkException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.rename(Path, Path, Options.Rename...) except that Path f must be for this file system.

オーバーライド:

renameInternal クラス内 AbstractFileSystem

例外:

IOException

org.apache.hadoop.fs.UnresolvedLinkException

renameInternal

public void renameInternal(Path src,
                           Path dst)
                    throws org.apache.hadoop.security.AccessControlException,
                           FileAlreadyExistsException,
                           FileNotFoundException,
                           ParentNotDirectoryException,
                           org.apache.hadoop.fs.UnresolvedLinkException,
                           IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.rename(Path, Path, Options.Rename...) except that Path f must be for this file system and NO OVERWRITE is performed. File systems that do not have a built in overwrite need implement only this method and can take advantage of the default impl of the other AbstractFileSystem.renameInternal(Path, Path, boolean)

定義:

renameInternal クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileAlreadyExistsException

FileNotFoundException

ParentNotDirectoryException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

supportsSymlinks

public boolean supportsSymlinks()

クラスからコピーされた説明: AbstractFileSystem

Returns true if the file system supports symlinks, false otherwise.

オーバーライド:

supportsSymlinks クラス内 AbstractFileSystem

戻り値:

true if filesystem supports symlinks

createSymlink

public void createSymlink(Path target,
                          Path link,
                          boolean createParent)
                   throws IOException,
                          org.apache.hadoop.fs.UnresolvedLinkException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.createSymlink(Path, Path, boolean);

オーバーライド:

createSymlink クラス内 AbstractFileSystem

例外:

IOException

org.apache.hadoop.fs.UnresolvedLinkException

getLinkTarget

public Path getLinkTarget(Path f)
                   throws IOException

クラスからコピーされた説明: AbstractFileSystem

Partially resolves the path. This is used during symlink resolution in FSLinkResolver, and differs from the similarly named method FileContext.getLinkTarget(Path).

オーバーライド:

getLinkTarget クラス内 AbstractFileSystem

例外:

IOException - subclass implementations may throw IOException

setOwner

public void setOwner(Path f,
                     String username,
                     String groupname)
              throws org.apache.hadoop.security.AccessControlException,
                     FileNotFoundException,
                     org.apache.hadoop.fs.UnresolvedLinkException,
                     IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.setOwner(Path, String, String) except that Path f must be for this file system.

定義:

setOwner クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

setPermission

public void setPermission(Path f,
                          FsPermission permission)
                   throws org.apache.hadoop.security.AccessControlException,
                          FileNotFoundException,
                          org.apache.hadoop.fs.UnresolvedLinkException,
                          IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.setPermission(Path, FsPermission) except that Path f must be for this file system.

定義:

setPermission クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

setReplication

public boolean setReplication(Path f,
                              short replication)
                       throws org.apache.hadoop.security.AccessControlException,
                              FileNotFoundException,
                              org.apache.hadoop.fs.UnresolvedLinkException,
                              IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.setReplication(Path, short) except that Path f must be for this file system.

定義:

setReplication クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

setTimes

public void setTimes(Path f,
                     long mtime,
                     long atime)
              throws org.apache.hadoop.security.AccessControlException,
                     FileNotFoundException,
                     org.apache.hadoop.fs.UnresolvedLinkException,
                     IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.setTimes(Path, long, long) except that Path f must be for this file system.

定義:

setTimes クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

FileNotFoundException

org.apache.hadoop.fs.UnresolvedLinkException

IOException

setVerifyChecksum

public void setVerifyChecksum(boolean verifyChecksum)
                       throws org.apache.hadoop.security.AccessControlException,
                              IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.setVerifyChecksum(boolean, Path) except that Path f must be for this file system.

定義:

setVerifyChecksum クラス内 AbstractFileSystem

例外:

org.apache.hadoop.security.AccessControlException

IOException

getMountPoints

public org.apache.hadoop.fs.viewfs.ViewFs.MountPoint[] getMountPoints()

getDelegationTokens

public List<Token<?>> getDelegationTokens(String renewer)
                                   throws IOException

クラスからコピーされた説明: AbstractFileSystem

Get one or more delegation tokens associated with the filesystem. Normally a file system returns a single delegation token. A file system that manages multiple file systems underneath, could return set of delegation tokens for all the file systems it manages

パラメータ:

renewer - the account name that is allowed to renew the token.

戻り値:

List of delegation tokens. If delegation tokens not supported then return a list of size zero.

例外:

IOException

isValidName

public boolean isValidName(String src)

クラスからコピーされた説明: AbstractFileSystem

Returns true if the specified string is considered valid in the path part of a URI by this file system. The default implementation enforces the rules of HDFS, but subclasses may override this method to implement specific validation rules for specific file systems.

オーバーライド:

isValidName クラス内 AbstractFileSystem

パラメータ:

src - String source filename to check, path part of the URI

戻り値:

boolean true if the specified string is considered valid

modifyAclEntries

public void modifyAclEntries(Path path,
                             List<AclEntry> aclSpec)
                      throws IOException

クラスからコピーされた説明: AbstractFileSystem

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 AbstractFileSystem

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: AbstractFileSystem

Removes ACL entries from files and directories. Other ACL entries are retained.

オーバーライド:

removeAclEntries クラス内 AbstractFileSystem

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: AbstractFileSystem

Removes all default ACL entries from files and directories.

オーバーライド:

removeDefaultAcl クラス内 AbstractFileSystem

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: AbstractFileSystem

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 AbstractFileSystem

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: AbstractFileSystem

Fully replaces ACL of files and directories, discarding all existing entries.

オーバーライド:

setAcl クラス内 AbstractFileSystem

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: AbstractFileSystem

Gets the ACLs of files and directories.

オーバーライド:

getAclStatus クラス内 AbstractFileSystem

パラメータ:

path - Path to get

戻り値:

RemoteIterator which returns each AclStatus

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: AbstractFileSystem

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 AbstractFileSystem

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: AbstractFileSystem

Get an xattr 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 AbstractFileSystem

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: AbstractFileSystem

Get all of the xattrs for a file or directory. Only those xattrs for 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 AbstractFileSystem

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: AbstractFileSystem

Get all of the xattrs for a file or directory. Only those xattrs for 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 AbstractFileSystem

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: AbstractFileSystem

Get all of the xattr names for a file or directory. Only the xattr names for 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 AbstractFileSystem

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

removeXAttr

public void removeXAttr(Path path,
                        String name)
                 throws IOException

クラスからコピーされた説明: AbstractFileSystem

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 AbstractFileSystem

パラメータ:

path - Path to remove extended attribute

name - xattr name

例外:

IOException

createSnapshot

public Path createSnapshot(Path path,
                           String snapshotName)
                    throws IOException

クラスからコピーされた説明: AbstractFileSystem

The specification of this method matches that of FileContext.createSnapshot(Path, String).

オーバーライド:

createSnapshot クラス内 AbstractFileSystem

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: AbstractFileSystem

The specification of this method matches that of FileContext.renameSnapshot(Path, String, String).

オーバーライド:

renameSnapshot クラス内 AbstractFileSystem

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: AbstractFileSystem

The specification of this method matches that of FileContext.deleteSnapshot(Path, String).

オーバーライド:

deleteSnapshot クラス内 AbstractFileSystem

例外:

IOException

setStoragePolicy

public void setStoragePolicy(Path path,
                             String policyName)
                      throws IOException

クラスからコピーされた説明: AbstractFileSystem

Set the storage policy for a given file or directory.

オーバーライド:

setStoragePolicy クラス内 AbstractFileSystem

パラメータ:

path - file or directory path.

policyName - the name of the target storage policy. The list of supported Storage policies can be retrieved via AbstractFileSystem.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: AbstractFileSystem

Unset the storage policy set for a given file or directory.

オーバーライド:

unsetStoragePolicy クラス内 AbstractFileSystem

パラメータ:

src - file or directory path.

例外:

IOException

getStoragePolicy

public BlockStoragePolicySpi getStoragePolicy(Path src)
                                       throws IOException

Retrieve the storage policy for a given file or directory.

オーバーライド:

getStoragePolicy クラス内 AbstractFileSystem

パラメータ:

src - file or directory path.

戻り値:

storage policy for give file.

例外:

IOException