org.apache.hadoop.dfs
Interfaces 
FSConstants
Classes 
DataNode
DatanodeID
DatanodeInfo
DataNodeReport
DFSck
DFSShell
DistributedFileSystem
JspHelper
NameNode
NamenodeFsck
StreamFile
Enums 
FSConstants.SafeModeAction
Exceptions 
AlreadyBeingCreatedException
LeaseExpiredException
NotReplicatedYetException
SafeModeException