org.apache.hadoop.contrib.utils.join

类 TaggedMapOutput

java.lang.Object

org.apache.hadoop.contrib.utils.join.TaggedMapOutput

所有已实现的接口:

Writable

public abstract class TaggedMapOutput
extends Object
implements Writable

This abstract class serves as the base class for the values that flow from the mappers to the reducers in a data join job. Typically, in such a job, the mappers will compute the source tag of an input record based on its attributes or based on the file name of the input file. This tag will be used by the reducers to re-group the values of a given key according to their source tags.

字段概要

字段

限定符和类型	字段和说明
protected Text	tag

构造器概要

构造器

构造器和说明
TaggedMapOutput()

方法概要

方法

限定符和类型	方法和说明
TaggedMapOutput	clone(JobConf job)
abstract Writable	getData()
Text	getTag()
void	setTag(Text tag)

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.io.Writable

readFields, write

字段详细资料

tag

protected Text tag

构造器详细资料

TaggedMapOutput

public TaggedMapOutput()

方法详细资料

getTag

public Text getTag()

setTag

public void setTag(Text tag)

getData

public abstract Writable getData()

clone

public TaggedMapOutput clone(JobConf job)