org.apache.hadoop.dfs
Interfaces 
FSConstants
Upgradeable
Classes 
ChecksumDistributedFileSystem
DataChecksum
DataNode
DatanodeDescriptor
DatanodeID
DatanodeInfo
DFSAdmin
DFSck
DistributedFileSystem
FileDataServlet
FsckServlet
GetImageServlet
HftpFileSystem
JspHelper
ListPathsServlet
LocatedBlocks
NameNode
NamenodeFsck
NamenodeFsck.FsckResult
SecondaryNameNode
SecondaryNameNode.GetImageServlet
StreamFile
UpgradeStatusReport
Enums 
DatanodeInfo.AdminStates
FSConstants.NodeType
FSConstants.SafeModeAction
FSConstants.StartupOption
FSConstants.UpgradeAction
Exceptions 
AlreadyBeingCreatedException
LeaseExpiredException
NotReplicatedYetException
SafeModeException