接口 org.apache.hadoop.fs.PositionedReadable
的使用

使用PositionedReadable的程序包

程序包	说明
org.apache.hadoop.fs	An abstract file system API.
org.apache.hadoop.fs.ftp
org.apache.hadoop.hdfs	A distributed implementation of FileSystem.

org.apache.hadoop.fs中PositionedReadable的使用

实现PositionedReadable的org.apache.hadoop.fs中的类

限定符和类型	类和说明
class	BufferedFSInputStream A class optimizes reading from FSInputStream by bufferring
class	FSDataInputStream Utility that wraps a FSInputStream in a DataInputStream and buffers input through a BufferedInputStream.
class	FSInputChecker This is a generic input stream for verifying checksums for data before it is read by a user.
class	FSInputStream FSInputStream is a generic old InputStream with a little bit of RAF-style seek ability.

org.apache.hadoop.fs.ftp中PositionedReadable的使用

实现PositionedReadable的org.apache.hadoop.fs.ftp中的类

限定符和类型	类和说明
class	FTPInputStream

org.apache.hadoop.hdfs中PositionedReadable的使用

实现PositionedReadable的org.apache.hadoop.hdfs中的类

限定符和类型	类和说明
class	ByteRangeInputStream To support HTTP byte streams, a new connection to an HTTP server needs to be created each time.
static class	DFSClient.DFSDataInputStream The Hdfs implementation of FSDataInputStream
class	DFSClient.DFSInputStream DFSInputStream provides bytes from a named file.
static class	DFSClient.RemoteBlockReader This is a wrapper around connection to datadone and understands checksum, offset etc