org.apache.hadoop.mapreduce

Class InputSplit

java.lang.Object

org.apache.hadoop.mapreduce.InputSplit

Direct Known Subclasses:

CombineFileSplit, DBInputFormat.DBInputSplit, FileSplit, FileSplit

public abstract class InputSplit
extends java.lang.Object

InputSplit represents the data to be processed by an individual Mapper.

Typically, it presents a byte-oriented view on the input and is the responsibility of RecordReader of the job to process this and present a record-oriented view.

See Also:

InputFormat, RecordReader

Constructor Summary

Constructors

Constructor and Description
InputSplit()

Method Summary

Methods

Modifier and Type	Method and Description
abstract long	getLength() Get the size of the split, so that the input splits can be sorted by size.
abstract java.lang.String[]	getLocations() Get the list of nodes by name where the data for the split would be local.

Methods inherited from class java.lang.Object

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

Constructor Detail

InputSplit

public InputSplit()

Method Detail

getLength

public abstract long getLength()
                        throws java.io.IOException,
                               java.lang.InterruptedException

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

Returns:

the number of bytes in the split

Throws:

java.io.IOException

java.lang.InterruptedException

getLocations

public abstract java.lang.String[] getLocations()
                                         throws java.io.IOException,
                                                java.lang.InterruptedException

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

Returns:

a new array of the node nodes.

Throws:

java.io.IOException

java.lang.InterruptedException