AbstractFileSystem for hdfs
    over rpc and hdfs over web.See: Description
| Interface | Description | 
|---|---|
| Abortable | Abort data being written to  a stream, so that close() does
  not write the data. | 
| BatchListingOperations | Interface filesystems MAY implement to offer a batched list. | 
| 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
  ByteBufferrather than abyte[]. | 
| 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. | 
| FSBuilder<S,B extends FSBuilder<S,B>> | The base interface which various FileSystem FileContext Builder
 interfaces can extend, and which underlying implementations
 will then implement. | 
| FsConstants | FileSystem related constants. | 
| FutureDataInputStreamBuilder | Builder for input streams and subclasses whose return value is
 actually a completable future: this allows for better asynchronous
 operation. | 
| MultipartUploader | MultipartUploader is an interface for copying files multipart and across
 multiple nodes. | 
| PartHandle | Opaque, serializable reference to a part id for multipart uploads. | 
| PathFilter | |
| PathHandle | Opaque, serializable reference to an entity in the FileSystem. | 
| PositionedReadable | Stream that permits positional reading. | 
| Seekable | Stream that permits seeking. | 
| StreamCapabilities | Interface to query streams for supported capabilities. | 
| Syncable | This is the interface for flush/sync operations. | 
| UploadHandle | Opaque, serializable reference to an uploadId for multipart uploads. | 
| Class | Description | 
|---|---|
| AbstractFileSystem | This class provides an interface for implementors of a Hadoop file system
 (analogous to the VFS of Unix). | 
| AvroFSInput | Adapts an  FSDataInputStreamto 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. | 
| 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 for users of 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  FilterFileSystemcontains
 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  FSInputStreamin aDataInputStreamand buffers input through aBufferedInputStream. | 
| FSDataOutputStream | Utility that wraps a  OutputStreamin aDataOutputStream. | 
| FSDataOutputStreamBuilder<S extends FSDataOutputStream,B extends FSDataOutputStreamBuilder<S,B>> | Builder for  FSDataOutputStreamand 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. | 
| 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. | 
| Options.OpenFileOptions | The standard  openFile()options. | 
| PartialListing<T extends FileStatus> | 
 A partial listing of the children of a parent directory. | 
| 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 | 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  XAttris byte[], this class is to 
 covert byte[] to some kind of string representation or convert back. | 
| XAttrSetFlag | 
| 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. | 
| InvalidPathHandleException | Thrown when the constraints enoded in a  PathHandledo not hold. | 
| 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 | 
| UnsupportedMultipartUploaderException | MultipartUploader for a given file system name/scheme is not supported. | 
| Error | Description | 
|---|---|
| FSError | Thrown for unexpected filesystem errors, presumed to reflect disk errors
 in the native filesystem. | 
Implementations of AbstractFileSystem for hdfs
    over rpc and hdfs over web.
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