org.apache.hadoop.mapred.lib.aggregate

类 ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable>

java.lang.Object

org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJobBase<K1,V1>

所有已实现的接口:

Closeable, AutoCloseable, JobConfigurable, Mapper<K1,V1,Text,Text>, Reducer<Text,Text,Text,Text>

直接已知子类:

ValueAggregatorCombiner, ValueAggregatorMapper, ValueAggregatorReducer

public abstract class ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable>
extends Object
implements Mapper<K1,V1,Text,Text>, Reducer<Text,Text,Text,Text>

This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.

字段概要

字段

限定符和类型	字段和说明
protected ArrayList<ValueAggregatorDescriptor>	aggregatorDescriptorList

构造器概要

构造器

构造器和说明
ValueAggregatorJobBase()

方法概要

方法

限定符和类型	方法和说明
void	close()
void	configure(JobConf job) Initializes a new instance from a JobConf.
protected void	logSpec()

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.Mapper

map

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

reduce

字段详细资料

aggregatorDescriptorList

protected ArrayList<ValueAggregatorDescriptor> aggregatorDescriptorList

构造器详细资料

ValueAggregatorJobBase

public ValueAggregatorJobBase()

方法详细资料

configure

public void configure(JobConf job)

从接口复制的说明: JobConfigurable

Initializes a new instance from a JobConf.

指定者:

configure 在接口中 JobConfigurable

参数:

job - the configuration

logSpec

protected void logSpec()

close

public void close()
           throws IOException

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

抛出:

IOException