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FileSystem
.
See:
Description
Class Summary | |
DataNode | DataNode is a class (and program) that stores a set of blocks for a DFS deployment. |
DataNodeReport | A report on the status of a DataNode. |
DFSck | This class provides rudimentary checking of DFS volumes for errors and sub-optimal conditions. |
DFSck.Result | Result of checking, plus overall DFS statistics. |
DFSShell | This class provides some DFS administrative access. |
DistributedFileSystem | Implementation of the abstract FileSystem for the DFS system. |
NameNode | NameNode serves as both directory namespace manager and "inode table" for the Hadoop DFS. |
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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