alluxio.underfs.gcs

Class GCSUnderFileSystem

java.lang.Object

alluxio.underfs.BaseUnderFileSystem

alluxio.underfs.ObjectUnderFileSystem

alluxio.underfs.gcs.GCSUnderFileSystem

All Implemented Interfaces:

UnderFileSystem, Closeable, AutoCloseable

@ThreadSafe
public class GCSUnderFileSystem
extends ObjectUnderFileSystem

Google Cloud Storage UnderFileSystem implementation based on the jets3t library.

Nested Class Summary

Nested classes/interfaces inherited from class alluxio.underfs.ObjectUnderFileSystem

ObjectUnderFileSystem.DeleteBuffer, ObjectUnderFileSystem.ObjectListingChunk, ObjectUnderFileSystem.ObjectPermissions, ObjectUnderFileSystem.ObjectStatus, ObjectUnderFileSystem.ObjectStoreOperation<T>, ObjectUnderFileSystem.OperationBuffer<T>, ObjectUnderFileSystem.RenameBuffer

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

UnderFileSystem.Factory, UnderFileSystem.SpaceType

Field Summary

Fields inherited from class alluxio.underfs.ObjectUnderFileSystem

mExecutorService, mRootKeySupplier, PATH_SEPARATOR, PATH_SEPARATOR_CHAR

Fields inherited from class alluxio.underfs.BaseUnderFileSystem

EMPTY_ACL, mUfsConf, mUri

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	GCSUnderFileSystem(AlluxioURI uri, org.jets3t.service.impl.rest.httpclient.GoogleStorageService googleStorageService, String bucketName, UnderFileSystemConfiguration conf) Constructor for GCSUnderFileSystem.

Method Summary

Modifier and Type	Method and Description
protected boolean	copyObject(String src, String dst) Copies an object to another key.
boolean	createEmptyObject(String key) Creates a zero-byte object used to encode a directory.
static GCSUnderFileSystem	createInstance(AlluxioURI uri, UnderFileSystemConfiguration conf) Constructs a new instance of GCSUnderFileSystem.
protected OutputStream	createObject(String key) Creates an OutputStream for object uploads.
protected boolean	deleteObject(String key) Internal function to delete a key.
UfsDirectoryStatus	getExistingDirectoryStatus(String path) Gets the directory status.
protected String	getFolderSuffix() Get suffix used to encode a directory.
protected ObjectUnderFileSystem.ObjectListingChunk	getObjectListingChunk(String key, boolean recursive) Gets a (partial) object listing result for the given key.
protected ObjectUnderFileSystem.ObjectStatus	getObjectStatus(String key) Get metadata information about object.
protected ObjectUnderFileSystem.ObjectPermissions	getPermissions() Permissions for the mounted bucket.
protected String	getRootKey() Get full path of root in object store.
String	getUnderFSType() Returns the name of the under filesystem implementation.
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.
protected InputStream	openObject(String key, OpenOptions options, RetryPolicy retryPolicy) Internal function to open an input stream to an object.
void	setMode(String path, short mode) Changes posix file mode.
void	setOwner(String path, String user, String group) Sets the user and group of the given path.

Methods inherited from class alluxio.underfs.ObjectUnderFileSystem

cleanup, close, connectFromMaster, connectFromWorker, convertToFolderName, create, createNonexistingFile, createNonexistingFile, deleteDirectory, deleteExistingDirectory, deleteExistingDirectory, deleteExistingFile, deleteFile, deleteObjects, getBlockSizeByte, getChildName, getDirectoryStatus, getExistingFileStatus, getExistingStatus, getFileLocations, getFileLocations, getFileStatus, getListingChunkLength, getListingChunkLengthMax, getObjectListingChunkForPath, getParentPath, getSpace, getStatus, isDirectory, isExistingDirectory, isFile, isObjectStorage, isRoot, listInternal, listStatus, listStatus, mkdirs, mkdirsInternal, open, parentExists, renameDirectory, renameFile, renameRenamableDirectory, renameRenamableFile, retryOnException, stripPrefixIfPresent, supportsFlush

Methods inherited from class alluxio.underfs.BaseUnderFileSystem

create, deleteDirectory, exists, getAclPair, getActiveSyncInfo, getConfiguration, getFingerprint, getOperationMode, getParsedFingerprint, getParsedFingerprint, getPhysicalStores, isSeekable, 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

Constructor Detail

GCSUnderFileSystem

protected GCSUnderFileSystem(AlluxioURI uri,
                             org.jets3t.service.impl.rest.httpclient.GoogleStorageService googleStorageService,
                             String bucketName,
                             UnderFileSystemConfiguration conf)

Constructor for GCSUnderFileSystem.

Parameters:

uri - the AlluxioURI for this UFS

googleStorageService - the Jets3t GCS client

bucketName - bucket name of user's configured Alluxio bucket

conf - configuration for this UFS

Method Detail

createInstance

public static GCSUnderFileSystem createInstance(AlluxioURI uri,
                                                UnderFileSystemConfiguration conf)
                                         throws org.jets3t.service.ServiceException

Constructs a new instance of GCSUnderFileSystem.

Parameters:

uri - the AlluxioURI for this UFS

conf - the configuration for this UFS

Returns:

the created GCSUnderFileSystem instance

Throws:

org.jets3t.service.ServiceException - when a connection to GCS could not be created

getUnderFSType

public String getUnderFSType()

Description copied from interface: UnderFileSystem

Returns the name of the under filesystem implementation. The name should be lowercase and not include any spaces, e.g. "hdfs", "s3".

Returns:

name of the under filesystem implementation

setOwner

public void setOwner(String path,
                     String user,
                     String group)

Description copied from interface: UnderFileSystem

Sets the user and group of the given path. An empty implementation should be provided if unsupported.

Parameters:

path - the path of the file

user - the new owner to set, unchanged if null

group - the new group to set, unchanged if null

setMode

public void setMode(String path,
                    short mode)
             throws IOException

Description copied from interface: UnderFileSystem

Changes posix file mode.

Parameters:

path - the path of the file

mode - the mode to set in short format, e.g. 0777

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.

Specified by:

getExistingDirectoryStatus in interface UnderFileSystem

Overrides:

getExistingDirectoryStatus in class ObjectUnderFileSystem

Parameters:

path - the path to the directory

Returns:

the directory status

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 UnderFileSystem.open(String) but deals with the write-then-read eventual consistency issue.

Specified by:

openExistingFile in interface UnderFileSystem

Overrides:

openExistingFile in class ObjectUnderFileSystem

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.

Specified by:

openExistingFile in interface UnderFileSystem

Overrides:

openExistingFile in class ObjectUnderFileSystem

Parameters:

path - the file name

options - to open input stream

Returns:

The InputStream object

Throws:

IOException

copyObject

protected boolean copyObject(String src,
                             String dst)

Description copied from class: ObjectUnderFileSystem

Copies an object to another key.

Specified by:

copyObject in class ObjectUnderFileSystem

Parameters:

src - the source key to copy

dst - the destination key to copy to

Returns:

true if the operation was successful, false otherwise

createEmptyObject

public boolean createEmptyObject(String key)

Description copied from class: ObjectUnderFileSystem

Creates a zero-byte object used to encode a directory.

Specified by:

createEmptyObject in class ObjectUnderFileSystem

Parameters:

key - the key to create

Returns:

true if the operation was successful

createObject

protected OutputStream createObject(String key)
                             throws IOException

Description copied from class: ObjectUnderFileSystem

Creates an OutputStream for object uploads.

Specified by:

createObject in class ObjectUnderFileSystem

Parameters:

key - ufs key including scheme and bucket

Returns:

new OutputStream

Throws:

IOException

deleteObject

protected boolean deleteObject(String key)
                        throws IOException

Description copied from class: ObjectUnderFileSystem

Internal function to delete a key.

Specified by:

deleteObject in class ObjectUnderFileSystem

Parameters:

key - the key to delete

Returns:

true if successful, false if an exception is thrown

Throws:

IOException

getFolderSuffix

protected String getFolderSuffix()

Description copied from class: ObjectUnderFileSystem

Get suffix used to encode a directory.

Specified by:

getFolderSuffix in class ObjectUnderFileSystem

Returns:

folder suffix

getObjectListingChunk

protected ObjectUnderFileSystem.ObjectListingChunk getObjectListingChunk(String key,
                                                                         boolean recursive)
                                                                  throws IOException

Description copied from class: ObjectUnderFileSystem

Gets a (partial) object listing result for the given key.

Specified by:

getObjectListingChunk in class ObjectUnderFileSystem

Parameters:

key - pseudo-directory key excluding header and bucket

recursive - whether to request immediate children only, or all descendants

Returns:

chunked object listing, or null if key is not found

Throws:

IOException

getObjectStatus

protected ObjectUnderFileSystem.ObjectStatus getObjectStatus(String key)
                                                      throws IOException

Description copied from class: ObjectUnderFileSystem

Get metadata information about object. Implementations should process the key as is, which may be a file or a directory key.

Specified by:

getObjectStatus in class ObjectUnderFileSystem

Parameters:

key - ufs key to get metadata for

Returns:

ObjectUnderFileSystem.ObjectStatus if key exists and successful, otherwise null

Throws:

IOException

getPermissions

protected ObjectUnderFileSystem.ObjectPermissions getPermissions()

Description copied from class: ObjectUnderFileSystem

Permissions for the mounted bucket.

Specified by:

getPermissions in class ObjectUnderFileSystem

Returns:

permissions

getRootKey

protected String getRootKey()

Description copied from class: ObjectUnderFileSystem

Get full path of root in object store.

Specified by:

getRootKey in class ObjectUnderFileSystem

Returns:

full path including scheme and bucket

openObject

protected InputStream openObject(String key,
                                 OpenOptions options,
                                 RetryPolicy retryPolicy)

Description copied from class: ObjectUnderFileSystem

Internal function to open an input stream to an object.

Specified by:

openObject in class ObjectUnderFileSystem

Parameters:

key - the key to open

options - the open options

retryPolicy - the retry policy of the opened stream to solve eventual consistency issue

Returns:

an InputStream to read from key