org.apache.hadoop.examples

类 AggregateWordHistogram.AggregateWordHistogramPlugin

java.lang.Object

org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor

org.apache.hadoop.examples.AggregateWordHistogram.AggregateWordHistogramPlugin

所有已实现的接口:

ValueAggregatorDescriptor

封闭类:

AggregateWordHistogram

public static class AggregateWordHistogram.AggregateWordHistogramPlugin
extends ValueAggregatorBaseDescriptor

字段概要

从类继承的字段 org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor

DOUBLE_VALUE_SUM, inputFile, LONG_VALUE_MAX, LONG_VALUE_MIN, LONG_VALUE_SUM, STRING_VALUE_MAX, STRING_VALUE_MIN, UNIQ_VALUE_COUNT, VALUE_HISTOGRAM

从接口继承的字段 org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorDescriptor

ONE, TYPE_SEPARATOR

构造器概要

构造器

构造器和说明
AggregateWordHistogram.AggregateWordHistogramPlugin()

方法概要

方法

限定符和类型	方法和说明
ArrayList<Map.Entry<Text,Text>>	generateKeyValPairs(Object key, Object val) Parse the given value, generate an aggregation-id/value pair per word.

从类继承的方法 org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor

configure, generateEntry, generateValueAggregator

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

AggregateWordHistogram.AggregateWordHistogramPlugin

public AggregateWordHistogram.AggregateWordHistogramPlugin()

方法详细资料

generateKeyValPairs

public ArrayList<Map.Entry<Text,Text>> generateKeyValPairs(Object key,
                                                  Object val)

Parse the given value, generate an aggregation-id/value pair per word. The ID is of type VALUE_HISTOGRAM, with WORD_HISTOGRAM as the real id. The value is WORD\t1.

指定者:

generateKeyValPairs 在接口中 ValueAggregatorDescriptor

覆盖:

generateKeyValPairs 在类中 ValueAggregatorBaseDescriptor

参数:

key - input key

val - input value

返回:

a list of the generated pairs.