org.apache.crunch

Interface Source<T>

All Known Subinterfaces:

ReadableSource<T>, ReadableSourceTarget<T>, SourceTarget<T>, TableSource<K,V>, TableSourceTarget<K,V>

All Known Implementing Classes:

DataBaseSource

public interface Source<T>

A Source represents an input data set that is an input to one or more MapReduce jobs.

Method Summary

Methods

Modifier and Type	Method and Description
void	configureSource(org.apache.hadoop.mapreduce.Job job, int inputId) Configure the given job to use this source as an input.
long	getSize(org.apache.hadoop.conf.Configuration configuration) Returns the number of bytes in this Source.
PType<T>	getType() Returns the PType for this source.

Method Detail

getType

PType<T> getType()

Returns the PType for this source.

configureSource

void configureSource(org.apache.hadoop.mapreduce.Job job,
                   int inputId)
                     throws IOException

Configure the given job to use this source as an input.

Parameters:

job - The job to configure

inputId - For a multi-input job, an identifier for this input to the job

Throws:

IOException

getSize

long getSize(org.apache.hadoop.conf.Configuration configuration)

Returns the number of bytes in this Source.