org.apache.hadoop.mapreduce.lib.input

类 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.

另请参阅:

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

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.mapreduce.Mapper

Mapper.Context

构造器概要

构造器

构造器和说明
DelegatingMapper()

方法概要

方法

限定符和类型	方法和说明
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.

从类继承的方法 org.apache.hadoop.mapreduce.Mapper

cleanup, map

从类继承的方法 java.lang.Object

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

构造器详细资料

DelegatingMapper

public DelegatingMapper()

方法详细资料

setup

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

从类复制的说明: Mapper

Called once at the beginning of the task.

覆盖:

setup 在类中 Mapper<K1,V1,K2,V2>

抛出:

IOException

InterruptedException

run

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

从类复制的说明: Mapper

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

覆盖:

run 在类中 Mapper<K1,V1,K2,V2>

抛出:

IOException

InterruptedException