org.apache.hadoop.dfs
Class DatanodeInfo

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

All Implemented Interfaces:

Comparable, Writable, WritableComparable, Node

Direct Known Subclasses:

DatanodeDescriptor

public class DatanodeInfo
extends DatanodeID
implements Node

DatanodeInfo represents the status of a DataNode. This object is used for communication in the Datanode Protocol and the Client Protocol.

Author:

Mike Cafarella, Konstantin Shvachko

Nested Class Summary

static class

DatanodeInfo.AdminStates

Field Summary

protected DatanodeInfo.AdminStates	adminState
protected long	capacity
protected long	lastUpdate
protected long	remaining
protected int	xceiverCount

Fields inherited from class org.apache.hadoop.dfs.DatanodeID

infoPort, name, storageID

Method Summary

long	getCapacity() The raw capacity.
String	getDatanodeReport() A formatted string for reporting the status of the DataNode.
String	getHostName()
long	getLastUpdate() The time when this information was accurate.
int	getLevel() Return this node's level in the tree.
String	getNetworkLocation() rack name
Node	getParent() Return this node's parent
String	getPath()
long	getRemaining() The raw free space.
int	getXceiverCount() number of active connections
void	readFields(DataInput in) Reads the fields of this object from in.
void	setHostName(String host)
void	setLevel(int level)
void	setParent(Node parent)
void	write(DataOutput out) Writes the fields of this object to out.

Methods inherited from class org.apache.hadoop.dfs.DatanodeID

compareTo, equals, getHost, getInfoPort, getName, getPort, getStorageID, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.net.Node

getName

Field Detail

capacity

protected long capacity

remaining

protected long remaining

lastUpdate

protected long lastUpdate

xceiverCount

protected int xceiverCount

adminState

protected DatanodeInfo.AdminStates adminState

Method Detail

getCapacity

public long getCapacity()

The raw capacity.

getRemaining

public long getRemaining()

The raw free space.

getLastUpdate

public long getLastUpdate()

The time when this information was accurate.

getXceiverCount

public int getXceiverCount()

number of active connections

getNetworkLocation

public String getNetworkLocation()

rack name

Specified by:

getNetworkLocation in interface Node

getPath

public String getPath()

getHostName

public String getHostName()

setHostName

public void setHostName(String host)

getDatanodeReport

public String getDatanodeReport()

A formatted string for reporting the status of the DataNode.

getParent

public Node getParent()

Return this node's parent

Specified by:

getParent in interface Node

setParent

public void setParent(Node parent)

getLevel

public int getLevel()

Return this node's level in the tree. E.g. the root of a tree returns 0 and its children return 1

Specified by:

getLevel in interface Node

setLevel

public void setLevel(int level)

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

Overrides:

write in class DatanodeID

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

Overrides:

readFields in class DatanodeID

Throws:

IOException