org.apache.hadoop.dfs
Class DatanodeID

java.lang.Object
  org.apache.hadoop.dfs.DatanodeID

All Implemented Interfaces:

Comparable, Writable, WritableComparable

Direct Known Subclasses:

DatanodeInfo

public class DatanodeID
extends Object
implements WritableComparable

DatanodeID is composed of the data node name (hostname:portNumber) and the data storage ID, which it currently represents.

Author:

Konstantin Shvachko

Field Summary

protected int	infoPort
protected String	name
protected String	storageID

Constructor Summary

DatanodeID()
DatanodeID default constructor

DatanodeID(DatanodeID from)
DatanodeID copy constructor

DatanodeID(String nodeName, String storageID, int infoPort)
Create DatanodeID

Method Summary

int	compareTo(Object o) Comparable.
boolean	equals(Object to)
String	getHost()
int	getInfoPort()
String	getName()
int	getPort()
String	getStorageID()
int	hashCode()
void	readFields(DataInput in) Reads the fields of this object from in.
String	toString()
void	write(DataOutput out) Writes the fields of this object to out.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

name

protected String name

storageID

protected String storageID

infoPort

protected int infoPort

Constructor Detail

DatanodeID

public DatanodeID()

DatanodeID default constructor

DatanodeID

public DatanodeID(DatanodeID from)

DatanodeID copy constructor

Parameters:

from -

DatanodeID

public DatanodeID(String nodeName,
                  String storageID,
                  int infoPort)

Create DatanodeID

Parameters:

nodeName - (hostname:portNumber)

storageID - data storage ID

Method Detail

getName

public String getName()

Returns:

hostname:portNumber.

getStorageID

public String getStorageID()

Returns:

data storage ID.

getInfoPort

public int getInfoPort()

Returns:

infoPort (the port at which the HTTP server bound to)

getHost

public String getHost()

Returns:

hostname and no :portNumber.

getPort

public int getPort()

equals

public boolean equals(Object to)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

compareTo

public int compareTo(Object o)

Comparable. Basis of compare is the String name (host:portNumber) only.

Specified by:

compareTo in interface Comparable

Parameters:

o -

Returns:

as specified by Comparable.

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

Writes the fields of this object to out.

Specified by:

write in interface Writable

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

Reads the fields of this object from in. For efficiency, implementations should attempt to re-use storage in the existing object where possible.

Specified by:

readFields in interface Writable

Throws:

IOException