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

Direct Known Subclasses:

DataNodeReport

public class DatanodeInfo
extends DatanodeID

DatanodeInfo represents the status of a DataNode.

Author:

Mike Cafarella, Konstantin Shvachko

Field Summary

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.
long	getLastUpdate() The time when this information was accurate.
long	getRemaining() The raw free space.
int	getXceiverCount() number of active connections
long	lastUpdate() Deprecated. Use getLastUpdate() instead.
void	readFields(DataInput in) Reads the fields of this object from in.
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, getStorageID, hashCode, toString

Methods inherited from class java.lang.Object

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

Field Detail

capacity

protected long capacity

remaining

protected long remaining

lastUpdate

protected long lastUpdate

xceiverCount

protected int xceiverCount

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

lastUpdate

public long lastUpdate()

Deprecated. Use getLastUpdate() instead.

getDatanodeReport

public String getDatanodeReport()

A formatted string for reporting the status of the DataNode.

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