org.apache.hadoop.mapred.lib

类 IdentityMapper<K,V>

java.lang.Object

org.apache.hadoop.mapred.MapReduceBase

org.apache.hadoop.mapred.lib.IdentityMapper<K,V>

所有已实现的接口:

Closeable, AutoCloseable, JobConfigurable, Mapper<K,V,K,V>

public class IdentityMapper<K,V>
extends MapReduceBase
implements Mapper<K,V,K,V>

Implements the identity function, mapping inputs directly to outputs.

构造器概要

构造器

构造器和说明
IdentityMapper()

方法概要

方法

限定符和类型	方法和说明
void	map(K key, V val, OutputCollector<K,V> output, Reporter reporter) The identify function.

从类继承的方法 org.apache.hadoop.mapred.MapReduceBase

close, configure

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.mapred.JobConfigurable

configure

从接口继承的方法 java.io.Closeable

close

构造器详细资料

IdentityMapper

public IdentityMapper()

方法详细资料

map

public void map(K key,
       V val,
       OutputCollector<K,V> output,
       Reporter reporter)
         throws IOException

The identify function. Input key/value pair is written directly to output.

指定者:

map 在接口中 Mapper<K,V,K,V>

参数:

key - the input key.

val - the input value.

output - collects mapped keys and values.

reporter - facility to report progress.

抛出:

IOException