hadoop学习数据的相关内容

文章 2024-10-13 来自：开发者社区

Hadoop-14-Hive HQL学习与测试表连接查询 HDFS数据导入导出等操作逻辑运算函数查询全表查询 WHERE GROUP BY ORDER BY（一）

章节内容上一节我们完成了：启动Hive 测试Hive 修改配置简单测试背景介绍这里是三台公网云服务器，每台 2C4G，搭建一个Hadoop的学习环境，供我学习。之前已经在 VM 虚拟机上搭建过一次，但是没留下笔记，这次趁着前几天薅羊毛的3台机器，赶紧尝试在公网上搭建体验一下。注意，如果你和我...

文章 2024-10-13 来自：开发者社区

Hadoop-14-Hive HQL学习与测试表连接查询 HDFS数据导入导出等操作逻辑运算函数查询全表查询 WHERE GROUP BY ORDER BY（二）

接上篇：https://developer.aliyun.com/article/1621741?spm=a2c6h.13148508.setting.14.49764f0eO8xDpK 部分字段查询这与我们平常写SQL基本是一样的： select ename, sal...

文章 2023-08-04 来自：开发者社区

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端以连接字段作为key的分组已经完成，我们只需要在每一个分组当中将那些来源于不同文件的记录（在Map阶段已经打标志）分开，最后进行合并....

文章 2023-08-04 来自：开发者社区

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OutputFormat类，只要继承就行。1.2 自定义OutputFormat案例实操1、需求过滤输入的 l....

文章 2022-02-16 来自：开发者社区

Hadoop Hive概念学习系列之hive的数据压缩（七）

Hive文件存储格式包括以下几类： 1、TEXTFILE 2、SEQUENCEFILE 3、RCFILE 4、ORCFILE 其中TEXTFILE为默认格式，建表时不指定默认为这个格式，导入数据时会直接把数据文件拷贝到hdfs上不进行处理。 SEQUENCEFILE，RCFILE，ORCFILE格式的表不能直接从本地文件导入数据，数据要先导入到textfile格式的表中，然后再从表中用inse....

文章 2022-02-16 来自：开发者社区

Hadoop Hive概念学习系列之HDFS、Hive、MySQL、Sqoop之间的数据导入导出（强烈建议去看）（十八）

把MySQL里的数据导入到HDFS 　　1、使用MySQL工具手工导入　　把MySQL的导出数据导入到HDFS的最简单方法就是，使用命令行工具和MySQL语句。为了导出整个数据表或整个数据库的内容，MySQL提供了mysqldump工具。　　比如　　SELECT col1,col2 FORM TABLE &nbs...

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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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