mapreduce outputformat-阿里云

MapReduce【自定义OutputFormat】

MapReduce默认的输出格式为TextOutputFormat，它的父类是FileOutputFormat，即按行来写，且内容写到一个文本文件中去,但是并不能满足我们实际开发中的所有需求，所以就需要我们自定义OutPutFormat。自定义OutPutFormat输出数据到MySQL、HBase...

35 MAPREDUCE自定义outputFormat

需求现有一些原始日志需要做增强解析处理，流程：1、从原始日志文件中读取数据。2、根据日志中的一个URL字段到外部知识库中获取信息增强到原始日志。3、如果成功增强，则输出到增强结果目录；如果增强失败，则抽取原始数据中URL字段输出到待爬清单目录。分析程序的关键点是要在一个mapreduce程序中根据数...

Hadoop 分布式计算框架 MapReduce

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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（二）

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...

五十三、Mapreduce之自定义outputformat案例

案例需求：过滤输出的log日志，包含tuomasi的网址输出到 tuomasi.log文件，不包含 tuomasi 的网址输出到 other.log文件输入数据：期望输出数据：注：通过观...

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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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EMR实时计算实践