Package org.apache.hadoop.hdfs.protocol

Interface Summary

Interface	Description
ClientDatanodeProtocol	An client-datanode protocol for block recovery
ClientProtocol	ClientProtocol is used by user code via DistributedFileSystem class to communicate with the NameNode.

Class Summary

Class	Description
Block	A Block is a Hadoop FS primitive, identified by a long.
BlockListAsLongs	This class provides an interface for accessing list of blocks that has been implemented as long[].
BlockLocalPathInfo	A block and the full path information to the block data file and the metadata file stored on the local file system.
CorruptFileBlocks	Contains a list of paths corresponding to corrupt files and a cookie used for iterative calls to NameNode.listCorruptFileBlocks.
DatanodeID	This class represents the primary identifier for a Datanode.
DatanodeInfo	This class extends the primary identifier of a Datanode with ephemeral state, eg usage information, current administrative state, and the network location that is communicated to clients.
DirectoryListing	This class defines a partial listing of a directory to support iterative directory listing.
ExtendedBlock	Identifies a Block uniquely across the block pools
FSConstants	Deprecated Please use HdfsConstants.
HdfsBlocksMetadata	Augments an array of blocks on a datanode with additional information about where the block is stored.
HdfsConstants	Some handy constants
HdfsFileStatus	Interface that represents the over the wire information for a file.
HdfsLocatedFileStatus	Interface that represents the over the wire information including block locations for a file.
LayoutVersion	This class tracks changes in the layout version of HDFS.
LocatedBlock	Associates a block with the Datanodes that contain its replicas and other block metadata (E.g.
LocatedBlocks	Collection of blocks with their locations and the file length.
SnapshotDiffReport	This class represents to end users the difference between two snapshots of the same directory, or the difference between a snapshot of the directory and its current state.
SnapshotDiffReport.DiffReportEntry	Representing the full path and diff type of a file/directory where changes have happened.
SnapshotInfo	SnapshotInfo maintains information for a snapshot
SnapshottableDirectoryStatus	Metadata about a snapshottable directory

Enum Summary

Enum	Description
DatanodeInfo.AdminStates
HdfsConstants.DatanodeReportType
HdfsConstants.SafeModeAction
LayoutVersion.Feature	Enums for features that change the layout version.
SnapshotDiffReport.DiffType	Types of the difference, which include CREATE, MODIFY, DELETE, and RENAME.

Exception Summary

Exception	Description
AlreadyBeingCreatedException	The exception that happens when you ask to create a file that already is being created, but is not closed yet.
DSQuotaExceededException
FSLimitException
FSLimitException.MaxDirectoryItemsExceededException	Directory has too many items
FSLimitException.PathComponentTooLongException	Path component length is too long
NSQuotaExceededException
QuotaExceededException	This exception is thrown when modification to HDFS results in violation of a directory quota.
RecoveryInProgressException	Exception indicating that a replica is already being recovery.
SnapshotAccessControlException	Snapshot access related exception.
SnapshotException	Snapshot related exception.
UnregisteredNodeException	This exception is thrown when a node that has not previously registered is trying to access the name node.
UnresolvedPathException	Thrown when a symbolic link is encountered in a path.