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

Class ServerCommand

java.lang.Object

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

Direct Known Subclasses:

DatanodeCommand, NamenodeCommand

@Private
@Evolving
public abstract class ServerCommand
extends Object

Base class for a server command. Issued by the name-node to notify other servers what should be done. Commands are defined by actions defined in respective protocols.

See Also:

• DatanodeProtocol
• NamenodeProtocol

Constructor Summary

Constructors

Constructor	Description
ServerCommand(int action)	Create a command for the specified action.

Method Summary

Modifier and Type	Method	Description
int	getAction()	Get server command action.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

ServerCommand

public ServerCommand(int action)

Create a command for the specified action. Actions are protocol specific.

Parameters:

action - protocol specific action

See Also:

• DatanodeProtocol
• NamenodeProtocol

Method Details

getAction

public int getAction()

Get server command action.

Returns:

action code.

toString

public String toString()

Overrides:

toString in class Object