Package org.apache.hadoop.mapreduce.lib.join

Class CompositeInputSplit

java.lang.Object

org.apache.hadoop.mapreduce.InputSplit

org.apache.hadoop.mapreduce.lib.join.CompositeInputSplit

All Implemented Interfaces:

Writable

@Public
@Stable
public class CompositeInputSplit
extends InputSplit
implements Writable

This InputSplit contains a set of child InputSplits. Any InputSplit inserted into this collection must have a public default constructor.

Constructor Summary

Constructors

Constructor	Description
CompositeInputSplit()
CompositeInputSplit(int capacity)

Method Summary

Modifier and Type	Method	Description
void	add(InputSplit s)	Add an InputSplit to this collection.
InputSplit	get(int i)	Get ith child InputSplit.
long	getLength()	Return the aggregate length of all child InputSplits currently added.
long	getLength(int i)	Get the length of ith child InputSplit.
String[]	getLocation(int i)	getLocations from ith InputSplit.
String[]	getLocations()	Collect a set of hosts from all child InputSplits.
void	readFields(DataInput in)	Deserialize the fields of this object from in.
void	write(DataOutput out)	Write splits in the following format.

Methods inherited from class org.apache.hadoop.mapreduce.InputSplit

getLocationInfo

Methods inherited from class java.lang.Object

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

Constructor Details

CompositeInputSplit

public CompositeInputSplit()

CompositeInputSplit

public CompositeInputSplit(int capacity)

Method Details

add

public void add(InputSplit s)
         throws IOException,
InterruptedException

Add an InputSplit to this collection.

Throws:

IOException - If capacity was not specified during construction or if capacity has been reached.

InterruptedException

get

public InputSplit get(int i)

Get ith child InputSplit.

getLength

public long getLength()
               throws IOException

Return the aggregate length of all child InputSplits currently added.

Specified by:

getLength in class InputSplit

Returns:

the number of bytes in the split

Throws:

IOException

getLength

public long getLength(int i)
               throws IOException,
InterruptedException

Get the length of ith child InputSplit.

Throws:

IOException

InterruptedException

getLocations

public String[] getLocations()
                      throws IOException,
InterruptedException

Collect a set of hosts from all child InputSplits.

Specified by:

getLocations in class InputSplit

Returns:

a new array of the node nodes.

Throws:

IOException

InterruptedException

getLocation

public String[] getLocation(int i)
                     throws IOException,
InterruptedException

getLocations from ith InputSplit.

Throws:

IOException

InterruptedException

write

public void write(DataOutput out)
           throws IOException

Write splits in the following format. <count><class1><class2>...<classn><split1><split2>...<splitn>

Specified by:

write in interface Writable

Parameters:

out - DataOuput to serialize this object into.

Throws:

IOException - any other problem for write.

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 - If the child InputSplit cannot be read, typically for failing access checks.