org.apache.hadoop.dfs
Class DatanodeID

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

All Implemented Interfaces:

Comparable<DatanodeID>, Writable, WritableComparable<DatanodeID>

Direct Known Subclasses:

DatanodeInfo

public class DatanodeID
extends Object
implements WritableComparable<DatanodeID>

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

Field Summary

protected int	infoPort
protected int	ipcPort
protected String	name
protected String	storageID

Constructor Summary

DatanodeID()
Equivalent to DatanodeID("").

DatanodeID(DatanodeID from)
DatanodeID copy constructor

DatanodeID(String nodeName)
Equivalent to DatanodeID(nodeName, "", -1, -1).

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

Method Summary

int	compareTo(DatanodeID that) Comparable.
boolean	equals(Object to)
String	getHost()
int	getInfoPort()
int	getIpcPort()
String	getName()
int	getPort()
String	getStorageID()
int	hashCode()
void	readFields(DataInput in) Deserialize the fields of this object from in.
String	toString()
void	write(DataOutput out) Serialize 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

ipcPort

protected int ipcPort

Constructor Detail

DatanodeID

public DatanodeID()

Equivalent to DatanodeID("").

DatanodeID

public DatanodeID(String nodeName)

Equivalent to DatanodeID(nodeName, "", -1, -1).

DatanodeID

public DatanodeID(DatanodeID from)

DatanodeID copy constructor

Parameters:

from -

DatanodeID

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

Create DatanodeID

Parameters:

nodeName - (hostname:portNumber)

storageID - data storage ID

infoPort - info server port

ipcPort - ipc server port

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)

getIpcPort

public int getIpcPort()

Returns:

ipcPort (the port at which the IPC 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(DatanodeID that)

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

Specified by:

compareTo in interface Comparable<DatanodeID>

Parameters:

that -

Returns:

as specified by Comparable.

write

public void write(DataOutput out)
           throws IOException

Serialize the fields of this object to out.

Specified by:

write in interface Writable

Parameters:

out - DataOuput to serialize this object into.

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Deserialize 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

Parameters:

in - DataInput to deseriablize this object from.

Throws:

IOException