Package org.apache.hadoop.hdfs

Interface Summary

Interface	Description
BlockReader	A BlockReader is responsible for reading a single block from a single datanode.
DFSUtilClient.SnapshotDiffReportFunction
DFSUtilClient.SnapshotDiffReportListingFunction
RemotePeerFactory

Class Summary

Class	Description
ClientContext	ClientContext contains context information for a client.
ClientGSIContext	Global State Id context for the client.
DeadNodeDetector	Detect the dead nodes in advance, and share this information among all the DFSInputStreams in the same client.
DFSClient	DFSClient can connect to a Hadoop Filesystem and perform basic file tasks.
DFSClient.DFSDataInputStream	Deprecated. use HdfsDataInputStream instead.
DFSClient.Renewer
DFSClientFaultInjector	Used for injecting faults in DFSClient and DFSOutputStream tests.
DFSHedgedReadMetrics	The client-side metrics for hedged read feature.
DFSInotifyEventInputStream	Stream for reading inotify events.
DFSInputStream	DFSInputStream provides bytes from a named file.
DFSOpsCountStatistics	This storage statistics tracks how many times each DFS operation was issued.
DFSOutputStream	DFSOutputStream creates files from a stream of bytes.
DFSPacket	DFSPacket is used by DataStreamer and DFSOutputStream.
DFSStripedInputStream	DFSStripedInputStream reads from striped block groups.
DFSStripedOutputStream	This class supports writing files in striped layout and erasure coded format.
DFSUtilClient
DFSUtilClient.CorruptedBlocks	A utility class as a container to put corrupted blocks, shared by client and datanode.
DistributedFileSystem	Implementation of the abstract FileSystem for the DFS system.
DistributedFileSystem.HdfsDataOutputStreamBuilder	HdfsDataOutputStreamBuilder provides the HDFS-specific capabilities to write file on HDFS.
ExtendedBlockId	An immutable key which identifies a block.
HAUtilClient
HdfsConfiguration	Adds deprecated keys into the configuration.
HdfsKMSUtil	Utility class for key provider related methods in hdfs client package.
KeyProviderCache
LocatedBlocksRefresher	Periodically refresh the underlying cached LocatedBlocks for eligible registered DFSInputStreams.
NameNodeProxiesClient	Create proxy objects with ClientProtocol and HAServiceProtocol to communicate with a remote NN.
NameNodeProxiesClient.ProxyAndInfo<PROXYTYPE>	Wrapper for a client proxy as well as its associated service ID.
PeerCache	A cache of input stream sockets to Data Node.
ReadStatistics	A utility class that maintains statistics for reading.
ReplicaAccessor	The public API for ReplicaAccessor objects.
ReplicaAccessorBuilder	The public API for creating a new ReplicaAccessor.
StripedDataStreamer	This class extends DataStreamer to support writing striped blocks to datanodes.
ViewDistributedFileSystem	The ViewDistributedFileSystem is an extended class to DistributedFileSystem with additional mounting functionality.
XAttrHelper

Enum Summary

Enum	Description
AddBlockFlag	AddBlockFlag provides hints for new block allocation and placement.
DFSOpsCountStatistics.OpType	This is for counting distributed file system operations.

Exception Summary

Exception	Description
BlockMissingException	This exception is thrown when a read encounters a block that has no locations associated with it.
CannotObtainBlockLengthException	This exception is thrown when the length of a LocatedBlock instance can not be obtained.
UnknownCipherSuiteException	Thrown when an unknown cipher suite is encountered.
UnknownCryptoProtocolVersionException