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Package org.apache.hadoop.hdfs.protocol

Removed Classes
UnregisteredDatanodeException This exception is thrown when a datanode that has not previously registered is trying to access the name node.
 

Added Classes
BlockListAsLongs.BlockReportIterator Iterates over blocks in the block report.
DSQuotaExceededException  
DataTransferProtocol.
BlockConstructionStage
 
DataTransferProtocol.Op Operation
DataTransferProtocol.
PipelineAck
reply
DataTransferProtocol.Receiver Receiver
DataTransferProtocol.Sender Sender
DataTransferProtocol.Status Status
DirectoryListing This class defines a partial listing of a directory to support iterative directory listing.
HdfsFileStatus Interface that represents the over the wire information for a file.
NSQuotaExceededException  
RecoveryInProgressException Exception indicating that a replica is already being recovery.
UnregisteredNodeException This exception is thrown when a node that has not previously registered is trying to access the name node.
UnresolvedPathException Thrown when a symbolic link is encountered in a path.
 

Changed Classes and Interfaces
Block A Block is a Hadoop FS primitive identified by a long.
BlockListAsLongs This class provides an interface for accessing list of blocks that has been implemented as long[].
ClientDatanodeProtocol An client-datanode protocol for block recovery
ClientProtocol ClientProtocol is used by user code via org.apache.hadoop.hdfs.DistributedFileSystem class to communicate with the NameNode.
DataTransferProtocol Transfer data to/from datanode using a streaming protocol.
DatanodeInfo DatanodeInfo represents the status of a DataNode.
FSConstants Some handy constants
LocatedBlock A LocatedBlock is a pair of Block DatanodeInfo[] objects.
LocatedBlocks Collection of blocks with their locations and the file length.
QuotaExceededException This exception is thrown when modification to HDFS results in violation of a directory quota.