Package org.apache.hadoop.hdfs

A distributed implementation of FileSystem.

See: Description

Interface Summary

Interface	Description
BlockReader	A BlockReader is responsible for reading a single block from a single datanode.

Class Summary

Class	Description
ByteRangeInputStream	To support HTTP byte streams, a new connection to an HTTP server needs to be created each time.
ByteRangeInputStream.URLOpener	This class wraps a URL and provides method to open connection.
CorruptFileBlockIterator	Provides an iterator interface for listCorruptFileBlocks.
HsftpFileSystem.DummyHostnameVerifier	Dummy hostname verifier that is used to bypass hostname checking
HsftpFileSystem.DummyTrustManager	Dummy trustmanager that is used to trust all server certificates

Package org.apache.hadoop.hdfs Description

A distributed implementation of FileSystem. This is loosely modelled after Google's GFS.

The most important difference is that unlike GFS, Hadoop DFS files have strictly one writer at any one time. Bytes are always appended to the end of the writer's stream. There is no notion of "record appends" or "mutations" that are then checked or reordered. Writers simply emit a byte stream. That byte stream is guaranteed to be stored in the order written.