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

Interface InterDatanodeProtocol

All Known Implementing Classes:

DataNode, InterDatanodeProtocolTranslatorPB

@Private
public interface InterDatanodeProtocol

An inter-datanode protocol for updating generation stamp

Field Summary

Fields

Modifier and Type	Field	Description
static org.slf4j.Logger	LOG
static long	versionID	Until version 9, this class InterDatanodeProtocol served as both the interface to the DN AND the RPC protocol used to communicate with the DN.

Method Summary

Modifier and Type	Method	Description
ReplicaRecoveryInfo	initReplicaRecovery(BlockRecoveryCommand.RecoveringBlock rBlock)	Initialize a replica recovery.
java.lang.String	updateReplicaUnderRecovery(org.apache.hadoop.hdfs.protocol.ExtendedBlock oldBlock, long recoveryId, long newBlockId, long newLength)	Update replica with the new generation stamp and length.

Field Detail

LOG

static final org.slf4j.Logger LOG

versionID

static final long versionID

Until version 9, this class InterDatanodeProtocol served as both the interface to the DN AND the RPC protocol used to communicate with the DN. This class is used by both the DN to insulate from the protocol serialization. If you are adding/changing DN's interface then you need to change both this class and ALSO related protocol buffer wire protocol definition in InterDatanodeProtocol.proto. For more details on protocol buffer wire protocol, please see .../org/apache/hadoop/hdfs/protocolPB/overview.html

See Also:

Constant Field Values

Method Detail

initReplicaRecovery

ReplicaRecoveryInfo initReplicaRecovery(BlockRecoveryCommand.RecoveringBlock rBlock)
                                 throws java.io.IOException

Initialize a replica recovery.

Returns:

actual state of the replica on this data-node or null if data-node does not have the replica.

Throws:

java.io.IOException

updateReplicaUnderRecovery

java.lang.String updateReplicaUnderRecovery(org.apache.hadoop.hdfs.protocol.ExtendedBlock oldBlock,
                                            long recoveryId,
                                            long newBlockId,
                                            long newLength)
                                     throws java.io.IOException

Update replica with the new generation stamp and length.

Throws:

java.io.IOException