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Package org.apache.hadoop.hdfs.server.protocol

Removed Classes
BlockMetaDataInfo Meta data information for a block
 

Added Classes and Interfaces
BlockRecoveryCommand BlockRecoveryCommand is an instruction to a data-node to recover the specified blocks.
BlockRecoveryCommand.
RecoveringBlock
This is a block with locations from which it should be recovered and the new generation stamp which the block will have after successful recovery.
CheckpointCommand Checkpoint command.
KeyUpdateCommand  
NamenodeCommand Base class for name-node command.
NamenodeProtocols The full set of RPC methods implemented by the Namenode.
NamenodeRegistration Information sent by a subordinate name-node to the active name-node during the registration process.
NodeRegistration Generic class specifying information which need to be sent to the name-node during the registration process.
ReplicaRecoveryInfo Replica recovery information.
ServerCommand Base class for a server command.
 

Changed Classes and Interfaces
DatanodeCommand Base class for data-node command.
DatanodeProtocol Protocol that a DFS datanode uses to communicate with the NameNode.
DatanodeRegistration DatanodeRegistration class contains all information the name-node needs to identify and verify a data-node when it contacts the name-node.
InterDatanodeProtocol An inter-datanode protocol for updating generation stamp
NamenodeProtocol Protocol that a secondary NameNode uses to communicate with the NameNode.
NamespaceInfo NamespaceInfo is returned by the name-node in reply to a data-node handshake.