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

Class BlockRecoveryCommand

java.lang.Object

org.apache.hadoop.hdfs.server.protocol.ServerCommand

org.apache.hadoop.hdfs.server.protocol.DatanodeCommand

org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand

@Private
@Evolving
public class BlockRecoveryCommand
extends DatanodeCommand

BlockRecoveryCommand is an instruction to a data-node to recover the specified blocks. The data-node that receives this command treats itself as a primary data-node in the recover process. Block recovery is identified by a recoveryId, which is also the new generation stamp, which the block will have after the recovery succeeds.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	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.
static class	BlockRecoveryCommand.RecoveringStripedBlock

Constructor Summary

Constructors

Constructor	Description
BlockRecoveryCommand()	Create empty BlockRecoveryCommand.
BlockRecoveryCommand(int capacity)	Create BlockRecoveryCommand with the specified capacity for recovering blocks.
BlockRecoveryCommand(java.util.Collection<BlockRecoveryCommand.RecoveringBlock> blocks)

Method Summary

Modifier and Type	Method	Description
void	add(BlockRecoveryCommand.RecoveringBlock block)	Add recovering block to the command.
java.util.Collection<BlockRecoveryCommand.RecoveringBlock>	getRecoveringBlocks()	Return the list of recovering blocks.
java.lang.String	toString()

Methods inherited from class org.apache.hadoop.hdfs.server.protocol.ServerCommand

getAction

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

BlockRecoveryCommand

public BlockRecoveryCommand()

Create empty BlockRecoveryCommand.

BlockRecoveryCommand

public BlockRecoveryCommand(int capacity)

Create BlockRecoveryCommand with the specified capacity for recovering blocks.

BlockRecoveryCommand

public BlockRecoveryCommand(java.util.Collection<BlockRecoveryCommand.RecoveringBlock> blocks)

Method Detail

getRecoveringBlocks

public java.util.Collection<BlockRecoveryCommand.RecoveringBlock> getRecoveringBlocks()

Return the list of recovering blocks.

add

public void add(BlockRecoveryCommand.RecoveringBlock block)

Add recovering block to the command.

toString

public java.lang.String toString()

Overrides:

toString in class ServerCommand