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Package org.apache.hadoop.hdfs.server.namenode

Removed Classes
JspHelper  
NamenodeFsck.FsckResult FsckResult of checking plus overall DFS statistics.
 

Added Classes and Interfaces
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.
BlockPlacementPolicy.
NotEnoughReplicasException
 
BlockPlacementPolicyDefault The class is responsible for choosing the desired number of targets for placing block replicas.
ContentSummaryServlet Servlets for file checksum
DelegationTokenServlet Serve delegation tokens over http for use in hftp.
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.
INodeSymlink An INode representing a symbolic link.
UnsupportedActionException This exception is thrown when an operation is not supported.
 

Changed Classes
CheckpointSignature A unique signature intended to identify checkpoint transactions.
DatanodeDescriptor DatanodeDescriptor tracks stats on a given DataNode such as available storage capacity last update time etc.
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.
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.
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.
SafeModeException This exception is thrown when the name node is in safe mode.
SecondaryNameNode The Secondary NameNode is a helper to the primary NameNode.
StreamFile  
UpgradeObjectNamenode Base class for name-node upgrade objects.