Package org.apache.hadoop.fs

Implementations of AbstractFileSystem for hdfs over rpc and hdfs over web.

See: Description

Interface Summary

Interface	Description
BlockStoragePolicySpi	A storage policy specifies the placement of block replicas on specific storage types.
ByteBufferPositionedReadable	Implementers of this interface provide a positioned read API that writes to a ByteBuffer rather than a byte[].
ByteBufferReadable	Implementers of this interface provide a read API that writes to a ByteBuffer, not a byte[].
CanSetDropBehind
CanSetReadahead
CanUnbuffer	FSDataInputStreams implement this interface to indicate that they can clear their buffers on request.
FsConstants	FileSystem related constants.
PathFilter
PositionedReadable	Stream that permits positional reading.
Seekable	Stream that permits seeking.
StreamCapabilities	Interface to query streams for supported capabilities.
Syncable	This interface for flush/sync operation.
VolumeId	Opaque interface that identifies a disk location.

Class Summary

Class	Description
AbstractFileSystem	This class provides an interface for implementors of a Hadoop file system (analogous to the VFS of Unix).
AvroFSInput	Adapts an FSDataInputStream to Avro's SeekableInput interface.
BlockLocation	Represents the network location of a block, information about the hosts that contain block replicas, and other block metadata (E.g.
BlockStorageLocation	Deprecated
ChecksumFileSystem	Abstract Checksumed FileSystem.
CommonConfigurationKeysPublic	This class contains constants for configuration keys used in the common code.
ContentSummary	Store the summary of a content (a directory or a file).
FileChecksum	An abstract class representing file checksums for files.
FileContext	The FileContext class provides an interface to the application writer for using the Hadoop file system.
FileStatus	Interface that represents the client side information for a file.
FileSystem	An abstract base class for a fairly generic filesystem.
FileUtil	A collection of file-processing util methods
FilterFileSystem	A FilterFileSystem contains some other file system, which it uses as its basic file system, possibly transforming the data along the way or providing additional functionality.
FSDataInputStream	Utility that wraps a FSInputStream in a DataInputStream and buffers input through a BufferedInputStream.
FSDataOutputStream	Utility that wraps a OutputStream in a DataOutputStream.
FSDataOutputStreamBuilder<S extends FSDataOutputStream,B extends FSDataOutputStreamBuilder<S,B>>	Builder for FSDataOutputStream and its subclasses.
FSInputStream	FSInputStream is a generic old InputStream with a little bit of RAF-style seek ability.
FsServerDefaults	Provides server default configuration values to clients.
FsStatus	This class is used to represent the capacity, free and used space on a FileSystem.
GlobFilter	A filter for POSIX glob pattern with brace expansions.
HdfsVolumeId	HDFS-specific volume identifier which implements VolumeId.
LocalFileSystem	Implement the FileSystem API for the checksumed local filesystem.
LocatedFileStatus	This class defines a FileStatus that includes a file's block locations.
Options	This class contains options related to file system operations.
Path	Names a file or directory in a FileSystem.
QuotaUsage	Store the quota usage of a directory.
RawLocalFileSystem	Implement the FileSystem API for the raw local filesystem.
StorageStatistics	StorageStatistics contains statistics data for a FileSystem or FileContext instance.
StreamCapabilitiesPolicy	Static methods to implement policies for StreamCapabilities.
SWebHdfs	AbstractFileSystem implementation for HDFS over the web (secure).
Trash	Provides a trash facility which supports pluggable Trash policies.
TrashPolicy	This interface is used for implementing different Trash policies.
WebHdfs	AbstractFileSystem implementation for HDFS over the web.

Enum Summary

Enum	Description
CacheFlag	Specifies semantics for CacheDirective operations.
CreateFlag	CreateFlag specifies the file create semantic.
GlobalStorageStatistics	Stores global storage statistics objects.
ReadOption	Options that can be used when reading from a FileSystem.
StorageType	Defines the types of supported storage media.
XAttrCodec	The value of XAttr is byte[], this class is to covert byte[] to some kind of string representation or convert back.
XAttrSetFlag

Exception Summary

Exception	Description
ChecksumException	Thrown for checksum errors.
FileAlreadyExistsException	Used when target file already exists for any operation and is not configured to be overwritten.
InvalidPathException	Path string is invalid either because it has invalid characters or due to other file system specific reasons.
ParentNotDirectoryException	Indicates that the parent of specified Path is not a directory as expected.
UnsupportedFileSystemException	File system for a given file system name/scheme is not supported

Error Summary

Error	Description
FSError	Thrown for unexpected filesystem errors, presumed to reflect disk errors in the native filesystem.

Package org.apache.hadoop.fs Description

Implementations of AbstractFileSystem for hdfs over rpc and hdfs over web.