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FileSystem
.
See:
Description
Class Summary | |
---|---|
BlockReader | This is a wrapper around connection to datadone and understands checksum, offset etc |
DeprecatedUTF8 | A simple wrapper around UTF8 . |
DFSClient | DFSClient can connect to a Hadoop Filesystem and perform basic file tasks. |
DFSClient.DFSDataInputStream | The Hdfs implementation of FSDataInputStream |
DFSConfigKeys | This class contains constants for configuration keys used in hdfs. |
DFSUtil | |
DFSUtil.ErrorSimulator | Utility class to facilitate junit test error simulation. |
DistributedFileSystem | Implementation of the abstract FileSystem for the DFS system. |
DistributedFileSystem.DiskStatus | Deprecated. Use FsStatus instead |
HdfsConfiguration | Adds deprecated keys into the configuration. |
HDFSPolicyProvider | PolicyProvider for HDFS protocols. |
HftpFileSystem | An implementation of a protocol for accessing filesystems over HTTP. |
HsftpFileSystem | An implementation of a protocol for accessing filesystems over HTTPS. |
HsftpFileSystem.DummyHostnameVerifier | Dummy hostname verifier that is used to bypass hostname checking |
HsftpFileSystem.DummyTrustManager | Dummy trustmanager that is used to trust all server certificates |
Exception Summary | |
---|---|
BlockMissingException | This exception is thrown when a read encounters a block that has no locations associated with it. |
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.
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