接口 org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorDescriptor
的使用

使用ValueAggregatorDescriptor的程序包

程序包	说明
org.apache.hadoop.examples	Hadoop example code.
org.apache.hadoop.mapred.lib.aggregate	Classes for performing various counting and aggregations.

org.apache.hadoop.examples中ValueAggregatorDescriptor的使用

实现ValueAggregatorDescriptor的org.apache.hadoop.examples中的类

限定符和类型	类和说明
static class	AggregateWordCount.WordCountPlugInClass
static class	AggregateWordHistogram.AggregateWordHistogramPlugin

org.apache.hadoop.mapred.lib.aggregate中ValueAggregatorDescriptor的使用

实现ValueAggregatorDescriptor的org.apache.hadoop.mapred.lib.aggregate中的类

限定符和类型	类和说明
class	UserDefinedValueAggregatorDescriptor This class implements a wrapper for a user defined value aggregator descriptor.
class	ValueAggregatorBaseDescriptor This class implements the common functionalities of the subclasses of ValueAggregatorDescriptor class.

类型参数类型为ValueAggregatorDescriptor的org.apache.hadoop.mapred.lib.aggregate中的字段

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