一 概述:
二 JobControl:
(1)功能:This class encapsulates a set of MapReduce jobs and its dependency.
三 ChainMapper和ChainReducer:
(1)The ChainMapper class allows to use multiple Mapper classes within a single Map task.
(2)The ChainReducer class allows to chain multiple Mapper classes after a Reducer within the Reducer task.
本文介绍MapReduce中的JobControl类,该类用于封装一组MapReduce作业及其依赖关系。此外,还介绍了ChainMapper和ChainReducer两个类,ChainMapper允许在单一Map任务中使用多个Mapper类,而ChainReducer则允许在Reducer任务之后链接多个Mapper类。
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