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Interface Summary | |
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FSClusterStats | This interface is used for retrieving the load related statistics of the cluster. |
FSInodeInfo | This interface is used used the pluggable block placement policy to expose a few characteristics of an Inode. |
Class Summary | |
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BackupNode | BackupNode. |
BackupStorage | |
BlockManager | Keeps information related to the blocks stored in the Hadoop cluster. |
BlockPlacementPolicy | This interface is used for choosing the desired number of targets for placing block replicas. |
BlockPlacementPolicyDefault | The class is responsible for choosing the desired number of targets for placing block replicas. |
CheckpointSignature | A unique signature intended to identify checkpoint transactions. |
ContentSummaryServlet | Servlets for file checksum |
CorruptReplicasMap | Stores information about all corrupt blocks in the File System. |
DatanodeDescriptor | DatanodeDescriptor tracks stats on a given DataNode, such as available storage capacity, last update time, etc., and maintains a set of blocks stored on the datanode. |
DatanodeDescriptor.BlockTargetPair | Block and targets pair |
DelegationTokenServlet | Serve delegation tokens over http for use in hftp. |
FileChecksumServlets | Servlets for file checksum |
FileChecksumServlets.GetServlet | Get FileChecksum |
FileChecksumServlets.RedirectServlet | Redirect file checksum queries to an appropriate datanode. |
FileDataServlet | Redirect queries about the hosted filesystem to an appropriate datanode. |
FsckServlet | This class is used in Namesystem's web server to do fsck on namenode. |
FSEditLog | FSEditLog maintains a log of the namespace modifications. |
FSImage | FSImage handles checkpointing and logging of the namespace edits. |
FSNamesystem | FSNamesystem does the actual bookkeeping work for the DataNode. |
GetImageServlet | This class is used in Namesystem's jetty to retrieve a file. |
INodeSymlink | An INode representing a symbolic link. |
LeaseManager | LeaseManager does the lease housekeeping for writing on files. |
ListPathsServlet | Obtain meta-information about a filesystem. |
NameNode | NameNode serves as both directory namespace manager and "inode table" for the Hadoop DFS. |
NamenodeFsck | This class provides rudimentary checking of DFS volumes for errors and sub-optimal conditions. |
SecondaryNameNode | Deprecated. |
StreamFile | |
UpgradeObjectNamenode | Base class for name-node upgrade objects. |
Exception Summary | |
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BlockPlacementPolicy.NotEnoughReplicasException | |
LeaseExpiredException | The lease that was being used to create this file has expired. |
NotReplicatedYetException | The file has not finished being written to enough datanodes yet. |
SafeModeException | This exception is thrown when the name node is in safe mode. |
UnsupportedActionException | This exception is thrown when an operation is not supported. |
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