org.apache.hadoop.examples.pi

Class DistSum.Machine.SummationSplit

java.lang.Object

org.apache.hadoop.mapreduce.InputSplit

org.apache.hadoop.examples.pi.DistSum.Machine.SummationSplit

All Implemented Interfaces:

Container<Summation>, Writable

Enclosing class:

DistSum.Machine

public static final class DistSum.Machine.SummationSplit
extends InputSplit
implements Writable, Container<Summation>

Split for the summations

Constructor Summary

Constructors

Constructor and Description
DistSum.Machine.SummationSplit()

Method Summary

Methods

Modifier and Type	Method and Description
Summation	getElement()
long	getLength() Get the size of the split, so that the input splits can be sorted by size.
String[]	getLocations() Get the list of nodes by name where the data for the split would be local.
void	readFields(DataInput in) Deserialize the fields of this object from in.
void	write(DataOutput out) Serialize the fields of this object to out.

Methods inherited from class java.lang.Object

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

Constructor Detail

DistSum.Machine.SummationSplit

public DistSum.Machine.SummationSplit()

Method Detail

getElement

public Summation getElement()

Specified by:

getElement in interface Container<Summation>

Returns:

The contained element.

getLength

public long getLength()

Get the size of the split, so that the input splits can be sorted by size.

Specified by:

getLength in class InputSplit

Returns:

the number of bytes in the split

getLocations

public String[] getLocations()

Get the list of nodes by name where the data for the split would be local. The locations do not need to be serialized.

Specified by:

getLocations in class InputSplit

Returns:

a new array of the node nodes.

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

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