org.apache.hadoop.examples.pi

Class DistSum.ReduceSide.SummationInputFormat

java.lang.Object

org.apache.hadoop.mapreduce.InputFormat<NullWritable,SummationWritable>

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

org.apache.hadoop.examples.pi.DistSum.ReduceSide.SummationInputFormat

Enclosing class:

DistSum.ReduceSide

public static class DistSum.ReduceSide.SummationInputFormat
extends DistSum.Machine.AbstractInputFormat

An InputFormat which returns a single summation.

Constructor Summary

Constructors

Constructor and Description
DistSum.ReduceSide.SummationInputFormat()

Method Summary

Methods

Modifier and Type	Method and Description
List<InputSplit>	getSplits(JobContext context) Logically split the set of input files for the job.

Methods inherited from class org.apache.hadoop.examples.pi.DistSum.Machine.AbstractInputFormat

createRecordReader

Methods inherited from class java.lang.Object

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

Constructor Detail

DistSum.ReduceSide.SummationInputFormat

public DistSum.ReduceSide.SummationInputFormat()

Method Detail

getSplits

public List<InputSplit> getSplits(JobContext context)

Description copied from class: InputFormat

Logically split the set of input files for the job.

Each InputSplit is then assigned to an individual Mapper for processing.

Note: The split is a logical split of the inputs and the input files are not physically split into chunks. For e.g. a split could be <input-file-path, start, offset> tuple. The InputFormat also creates the RecordReader to read the InputSplit.

Specified by:

getSplits in class InputFormat<NullWritable,SummationWritable>

Parameters:

context - job configuration.

Returns:

a list containing a single split of summation