org.apache.hadoop.dfs
Interfaces 
FSConstants
FSDatasetInterface
Upgradeable
Classes 
Balancer
ChecksumDistributedFileSystem
DataBlockScanner
DataBlockScanner.Servlet
DataChecksum
DataNode
DatanodeDescriptor
DatanodeID
DatanodeInfo
DFSAdmin
DFSck
DistributedFileSystem
DistributedFileSystem.DiskStatus
FileDataServlet
FsckServlet
FSDatasetInterface.BlockWriteStreams
FSDatasetInterface.MetaDataInputStream
GetImageServlet
HftpFileSystem
HsftpFileSystem
JspHelper
ListPathsServlet
LocatedBlocks
NameNode
NamenodeFsck
NamenodeFsck.FsckResult
NameNodeMetrics
SecondaryNameNode
SecondaryNameNode.GetImageServlet
StreamFile
UpgradeStatusReport
Enums 
DatanodeInfo.AdminStates
FSConstants.CheckpointStates
FSConstants.DatanodeReportType
FSConstants.NodeType
FSConstants.SafeModeAction
FSConstants.StartupOption
FSConstants.UpgradeAction
Exceptions 
AlreadyBeingCreatedException
LeaseExpiredException
NotReplicatedYetException
SafeModeException