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@[toc]11.MapReduce概述11.1MapReduce定义 MapReduce是一个分布式运算程序的编程框架，是用户开发“基于Hadoop的数据分析应用”的核心框架。 MapReduce核心功能是将用户编写的业务逻辑代码和自带默认组件整合成一个完整的分布式运算程序，并发运行在一个Ha...

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开发者学堂课程【Hadoop 分布式计算框架 MapReduc： MapReduce 进程】学习笔记，与课程紧密联系，让用户快速学习知识。课程地址：https://developer.aliyun.com/learning/course/94/detail/1478MapReduce 进程&nbs...

三句话告诉你 mapreduce 中MAP进程的数量怎么控制？

1、果断先上结论 1.如果想增加map个数，则设置mapred.map.tasks 为一个较大的值。 2.如果想减小map个数，则设置mapred.min.split.size 为一个较大的值。 3.如果输入中有很多小文件，依然想减少map个数，则需要将小文件merger为大文件，然后使用准则2。 ...

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开源大数据平台 E-MapReduce

开源大数据平台 E-MapReduce（简称“EMR”）是云原生开源大数据平台，向客户提供简单易集成的Hadoop、Hive、Spark、Flink、Presto、ClickHouse、StarRocks、Delta、Hudi等开源大数据计算和存储引擎服务。

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