org.apache.hadoop.hdfs.server.protocol

类 DatanodeCommand

java.lang.Object

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

所有已实现的接口:

Writable

直接已知子类:

BalancerBandwidthCommand, BlockCommand, KeyUpdateCommand, UpgradeCommand

public abstract class DatanodeCommand
extends Object
implements Writable

字段概要

字段

限定符和类型	字段和说明
static DatanodeCommand	FINALIZE
static DatanodeCommand	REGISTER

构造器概要

构造器

构造器和说明
DatanodeCommand()

方法概要

方法

限定符和类型	方法和说明
int	getAction()
void	readFields(DataInput in) Deserialize the fields of this object from in.
void	write(DataOutput out) Serialize the fields of this object to out.

从类继承的方法 java.lang.Object

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

字段详细资料

REGISTER

public static final DatanodeCommand REGISTER

FINALIZE

public static final DatanodeCommand FINALIZE

构造器详细资料

DatanodeCommand

public DatanodeCommand()

方法详细资料

getAction

public int getAction()

write

public void write(DataOutput out)
           throws IOException

从接口复制的说明: Writable

Serialize the fields of this object to out.

指定者:

write 在接口中 Writable

参数:

out - DataOuput to serialize this object into.

抛出:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

从接口复制的说明: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

指定者:

readFields 在接口中 Writable

参数:

in - DataInput to deseriablize this object from.

抛出:

IOException