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3、Join应用3.1 Reduce Join（1）Map端的主要工作：为来自不同表或文件的key/value对，打标签以区别不同来源的记录。然后用连接字段作为key，其余部分和新加的标志作为value，最后进行输出。（2）Reduce端的主要工作：在Reduce端以连接...

Hadoop学习---7、OutputFormat数据输出、MapReduce内核源码解析、Join应用、数据清洗、MapReduce开发总结（一）

1、OutputFormat数据输出1.1 OutputFormat接口实现类OutputFormat是MapReduce输出的基类，所以实现MapReduce输出都实现了OutputFormat接口。1、MapReduce默认的输出格式是TextOutputFormat2、也可以自定义Output...

Hadoop 分布式计算框架 MapReduce

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hadoop权威指南学习(一) - 天气预报MapReduce程序的开发和部署

看过Tom White写的Hadoop权威指南(大象书)的朋友一定得从第一个天气预报的Map Reduce程序所吸引，殊不知，Tom White大牛虽然在书中写了程序和讲解了原理，但是他以为你们都会部署了，这里轻描淡写给带过了，这样就给菜鸟们留了课题，其实在跑书中的程序的时候，如果没经验，还是会...

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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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