org.apache.hadoop.mapreduce.lib.input
Class DelegatingMapper<K1,V1,K2,V2>

java.lang.Object
  org.apache.hadoop.mapreduce.Mapper<K1,V1,K2,V2>
      org.apache.hadoop.mapreduce.lib.input.DelegatingMapper<K1,V1,K2,V2>

@InterfaceAudience.Private
@InterfaceStability.Unstable
public class DelegatingMapper<K1,V1,K2,V2>
extends Mapper<K1,V1,K2,V2>

An Mapper that delegates behavior of paths to multiple other mappers.

See Also:

MultipleInputs.addInputPath(Job, Path, Class, Class)

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper

Mapper.Context

Constructor Summary

DelegatingMapper()

Method Summary

void	run(Mapper.Context context) Expert users can override this method for more complete control over the execution of the Mapper.
protected void	setup(Mapper.Context context) Called once at the beginning of the task.

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

cleanup, map

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatingMapper

public DelegatingMapper()

Method Detail

setup

protected void setup(Mapper.Context context)
              throws IOException,
                     InterruptedException

Description copied from class: Mapper

Called once at the beginning of the task.

Overrides:

setup in class Mapper<K1,V1,K2,V2>

Throws:

IOException

InterruptedException

run

public void run(Mapper.Context context)
         throws IOException,
                InterruptedException

Description copied from class: Mapper

Expert users can override this method for more complete control over the execution of the Mapper.

Overrides:

run in class Mapper<K1,V1,K2,V2>

Throws:

IOException

InterruptedException