alluxio.underfs

Class ConsistentUnderFileSystem

java.lang.Object

alluxio.underfs.BaseUnderFileSystem

alluxio.underfs.ConsistentUnderFileSystem

All Implemented Interfaces:

UnderFileSystem, Closeable, AutoCloseable

Direct Known Subclasses:

HdfsUnderFileSystem, LocalUnderFileSystem, WebUnderFileSystem

public abstract class ConsistentUnderFileSystem
extends BaseUnderFileSystem

Represents a consistent under filesystem which does not have eventual consistency issues.

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.underfs.UnderFileSystem

UnderFileSystem.Factory, UnderFileSystem.SpaceType

Field Summary

Fields inherited from class alluxio.underfs.BaseUnderFileSystem

mUfsConf, mUri

Constructor Summary

Constructors

Constructor and Description
ConsistentUnderFileSystem(AlluxioURI uri, UnderFileSystemConfiguration ufsConf) Creates a new ConsistentUnderFileSystem for the given uri.

Method Summary

Modifier and Type	Method and Description
OutputStream	createNonexistingFile(String path) Creates a file in the under file system with the indicated name.
OutputStream	createNonexistingFile(String path, CreateOptions options) Creates a file in the under file system with the specified CreateOptions.
boolean	deleteExistingDirectory(String path) Deletes a directory from the under file system.
boolean	deleteExistingDirectory(String path, DeleteOptions options) Deletes a directory from the under file system with the indicated name.
boolean	deleteExistingFile(String path) Deletes a file from the under file system with the indicated name.
UfsDirectoryStatus	getExistingDirectoryStatus(String path) Gets the directory status.
UfsFileStatus	getExistingFileStatus(String path) Gets the file status.
UfsStatus	getExistingStatus(String path) Gets the file or directory status.
boolean	isExistingDirectory(String path) Checks if a directory exists in under file system.
InputStream	openExistingFile(String path) Opens an InputStream for a file in under filesystem at the indicated path.
InputStream	openExistingFile(String path, OpenOptions options) Opens an InputStream for a file in under filesystem at the indicated path.
boolean	renameRenamableDirectory(String src, String dst) Renames a directory from src to dst in under file system.
boolean	renameRenamableFile(String src, String dst) Renames a file from src to dst in under file system.

Methods inherited from class alluxio.underfs.BaseUnderFileSystem

create, deleteDirectory, exists, getAclPair, getActiveSyncInfo, getFingerprint, getOperationMode, getPhysicalStores, isObjectStorage, isSeekable, listStatus, mkdirs, open, resolveUri, setAclEntries, startActiveSyncPolling, startSync, stopActiveSyncPolling, stopSync, supportsActiveSync, validatePath

Methods inherited from class java.lang.Object

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

Methods inherited from interface alluxio.underfs.UnderFileSystem

cleanup, connectFromMaster, connectFromWorker, create, deleteDirectory, deleteFile, getBlockSizeByte, getDirectoryStatus, getFileLocations, getFileLocations, getFileStatus, getSpace, getStatus, getUnderFSType, isDirectory, isFile, listStatus, mkdirs, open, renameDirectory, renameFile, setMode, setOwner, supportsFlush

Methods inherited from interface java.io.Closeable

close

Constructor Detail

ConsistentUnderFileSystem

public ConsistentUnderFileSystem(AlluxioURI uri,
                                 UnderFileSystemConfiguration ufsConf)

Creates a new ConsistentUnderFileSystem for the given uri.

Parameters:

uri - path belonging to this under file system

ufsConf - UFS configuration

Method Detail

createNonexistingFile

public OutputStream createNonexistingFile(String path)
                                   throws IOException

Description copied from interface: UnderFileSystem

Creates a file in the under file system with the indicated name. Similar to UnderFileSystem.create(String) but deals with the delete-then-create eventual consistency issue.

Parameters:

path - the file name

Returns:

A OutputStream object

Throws:

IOException

createNonexistingFile

public OutputStream createNonexistingFile(String path,
                                          CreateOptions options)
                                   throws IOException

Description copied from interface: UnderFileSystem

Creates a file in the under file system with the specified CreateOptions. Similar to UnderFileSystem.create(String, CreateOptions) but deals with the delete-then-create eventual consistency issue.

Parameters:

path - the file name

options - the options for create

Returns:

A OutputStream object

Throws:

IOException

deleteExistingDirectory

public boolean deleteExistingDirectory(String path)
                                throws IOException

Description copied from interface: UnderFileSystem

Deletes a directory from the under file system. Similar to UnderFileSystem.deleteDirectory(String) but deals with the create-delete eventual consistency issue.

Parameters:

path - of the directory to delete

Returns:

true if directory was found and deleted, false otherwise

Throws:

IOException

deleteExistingDirectory

public boolean deleteExistingDirectory(String path,
                                       DeleteOptions options)
                                throws IOException

Description copied from interface: UnderFileSystem

Deletes a directory from the under file system with the indicated name. Similar to UnderFileSystem.deleteDirectory(String, DeleteOptions) but deals with the create-then-delete eventual consistency issue.

Parameters:

path - of the directory to delete

options - for directory delete semantics

Returns:

true if directory was found and deleted, false otherwise

Throws:

IOException

deleteExistingFile

public boolean deleteExistingFile(String path)
                           throws IOException

Description copied from interface: UnderFileSystem

Deletes a file from the under file system with the indicated name. Similar to UnderFileSystem.deleteFile(String) but deals with the create-then-delete eventual consistency issue.

Parameters:

path - of the file to delete

Returns:

true if file was found and deleted, false otherwise

Throws:

IOException

getExistingDirectoryStatus

public UfsDirectoryStatus getExistingDirectoryStatus(String path)
                                              throws IOException

Description copied from interface: UnderFileSystem

Gets the directory status. Similar to UnderFileSystem.getDirectoryStatus(String) but deals with the write-then-get-status eventual consistency issue.

Parameters:

path - the path to the directory

Returns:

the directory status

Throws:

IOException

getExistingFileStatus

public UfsFileStatus getExistingFileStatus(String path)
                                    throws IOException

Description copied from interface: UnderFileSystem

Gets the file status. Similar to UnderFileSystem.getFileStatus(String) but deals with the write-then-get-status eventual consistency issue.

Parameters:

path - the path to the file

Returns:

the file status

Throws:

IOException

getExistingStatus

public UfsStatus getExistingStatus(String path)
                            throws IOException

Description copied from interface: UnderFileSystem

Gets the file or directory status. Similar to UnderFileSystem.getStatus(String) but deals with the write-then-get-status eventual consistency issue.

Parameters:

path - the path to get the status

Returns:

the file or directory status

Throws:

IOException

isExistingDirectory

public boolean isExistingDirectory(String path)
                            throws IOException

Description copied from interface: UnderFileSystem

Checks if a directory exists in under file system. Similar to UnderFileSystem.isDirectory(String) but deals with the write-then-list eventual consistency issue.

Parameters:

path - the absolute directory path

Returns:

true if the path exists and is a directory, false otherwise

Throws:

IOException

openExistingFile

public InputStream openExistingFile(String path)
                             throws IOException

Description copied from interface: UnderFileSystem

Opens an InputStream for a file in under filesystem at the indicated path. Similar to #open(fString) but deals with the write-then-read eventual consistency issue.

Parameters:

path - the file name

Returns:

The InputStream object

Throws:

IOException

openExistingFile

public InputStream openExistingFile(String path,
                                    OpenOptions options)
                             throws IOException

Description copied from interface: UnderFileSystem

Opens an InputStream for a file in under filesystem at the indicated path. Similar to UnderFileSystem.open(String, OpenOptions) but deals with the write-then-read eventual consistency issue.

Parameters:

path - the file name

options - to open input stream

Returns:

The InputStream object

Throws:

IOException

renameRenamableDirectory

public boolean renameRenamableDirectory(String src,
                                        String dst)
                                 throws IOException

Description copied from interface: UnderFileSystem

Renames a directory from src to dst in under file system. Similar to UnderFileSystem.renameDirectory(String, String) but deals with the write-src-then-rename and delete-dst-then-rename eventual consistency issue.

Parameters:

src - the source directory path

dst - the destination directory path

Returns:

true if succeed, false otherwise

Throws:

IOException

renameRenamableFile

public boolean renameRenamableFile(String src,
                                   String dst)
                            throws IOException

Description copied from interface: UnderFileSystem

Renames a file from src to dst in under file system. Similar to UnderFileSystem.renameFile(String, String) but deals with the write-src-then-rename and delete-dst-then-rename eventual consistency issue.

Parameters:

src - the source file path

dst - the destination file path

Returns:

true if succeed, false otherwise

Throws:

IOException