org.apache.hadoop.mapred

类 MapReduceBase

java.lang.Object

org.apache.hadoop.mapred.MapReduceBase

所有已实现的接口:

Closeable, AutoCloseable, JobConfigurable

直接已知子类:

DistributedPentomino.PentMap, IdentityMapper, IdentityReducer, IndexUpdateCombiner, IndexUpdateMapper, IndexUpdateReducer, InverseMapper, Logalyzer.LogRegexMapper, LongSumReducer, MultiFileWordCount.MapClass, PiEstimator.PiMapper, PiEstimator.PiReducer, RegexMapper, TeraGen.SortGenMapper, TokenCountMapper

public class MapReduceBase
extends Object
implements Closeable, JobConfigurable

Base class for Mapper and Reducer implementations.

Provides default no-op implementations for a few methods, most non-trivial applications need to override some of them.

构造器概要

构造器

构造器和说明
MapReduceBase()

方法概要

方法

限定符和类型	方法和说明
void	close() Default implementation that does nothing.
void	configure(JobConf job) Default implementation that does nothing.

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

MapReduceBase

public MapReduceBase()

方法详细资料

close

public void close()
           throws IOException

Default implementation that does nothing.

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

抛出:

IOException

configure

public void configure(JobConf job)

Default implementation that does nothing.

指定者:

configure 在接口中 JobConfigurable

参数:

job - the configuration