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## Package org.apache.hadoop.fs

An abstract file system API.

See:
Description

Interface Summary
PathFilter |
PositionedReadable | Stream that permits positional reading.
Seekable | Stream that permits seeking.
Syncable | This interface declare the sync() operation.

Class Summary
BlockLocation |
BufferedFSInputStream | A class optimizes reading from FSInputStream by bufferring
ChecksumFileSystem | Abstract Checksumed FileSystem.
CommonConfigurationKeys | This class contains constants for configuration keys used in the common code.
ContentSummary | Store the summary of a content (a directory or a file).
DF | Filesystem disk space usage statistics.
DU | Filesystem disk space usage statistics.
FileChecksum | An abstract class representing file checksums for files.
FileStatus | Interface that represents the client side information for a file.
FileSystem | An abstract base class for a fairly generic filesystem.
FileSystem.Statistics |
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`, buffers output through a `BufferedOutputStream` and creates a checksum file.
FSInputChecker | This is a generic input stream for verifying checksums for data before it is read by a user.
FSInputStream | FSInputStream is a generic old InputStream with a little bit of RAF-style seek ability.
FSOutputSummer | This is a generic output stream for generating checksums for data before it is written to the underlying stream
FsShell | Provide command line access to a FileSystem.
FsUrlStreamHandlerFactory | Factory for URL stream handlers.
GlobPattern | A class for POSIX glob pattern with brace expansions.
HardLink | Class for creating hardlinks.
HardLink.LinkStats | HardLink statistics counters and methods.
HarFileSystem | This is an implementation of the Hadoop Archive Filesystem.
InMemoryFileSystem | Deprecated.
LocalDirAllocator | An implementation of a round-robin scheme for disk allocation for creating files.
LocalFileSystem | Implement the FileSystem API for the checksumed local filesystem.
MD5MD5CRC32FileChecksum | MD5 of MD5 of CRC32.
Path | Names a file or directory in a `FileSystem`.
RawLocalFileSystem | Implement the FileSystem API for the raw local filesystem.
Trash | Provides a trash feature.

Enum Summary
HardLink.OSType |

Exception Summary
ChecksumException | Thrown for checksum errors.
FileAlreadyExistsException | Used when target file already exists for any operation and is not configured to be overwritten.

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

## Package org.apache.hadoop.fs Description

An abstract file system API.

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