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Package org.apache.hadoop.hdfs.server.datanode

Added Classes and Interfaces
DatanodeJspHelper  
DirectoryScanner Periodically scans the data directories for block and block metadata files.
Replica This represents block replicas which stored in DataNode.
ReplicaInfo This class is used by datanodes to maintain meta data of its replicas.
ReplicaNotFoundException Exception indicating that DataNode does not have a replica that matches the target block.
 

Changed Classes and Interfaces
DataNode DataNode is a class (and program) that stores a set of blocks for a DFS deployment.
FSDataset FSDataset manages a set of data blocks.
FSDatasetInterface This is an interface for the underlying storage that stores blocks for a data node.