hadoop技术课程的相关内容

文章 2022-11-27 来自：开发者社区

Hadoop大数据技术课程总结2021-2022学年第1学期（下）

Stage1:Mapper － <TableScanOperator，ProjectionOperator，ParitialAggregationOperator>Reducer - <FinalAggregationOperator, ReducerSinkOperator>写到这里发现选取的例子并没有复杂表达式，比如我其实要计算大家统一加薪10％之后的成本，那我其实会....

文章 2022-11-27 来自：开发者社区

Hadoop大数据技术课程总结2021-2022学年第1学期（中）

3.4.MR的编程编程分析：map任务处理：读取输入文件内容，解析成key、value对。对输入文件的每一行，解析成key、value对。每一个键值对调用一次map函数。写自己的逻辑，对输入的key、value处理，转换成新的key、value输出。对输出的key、value进行分区。对不同分区的数据，按照key进行排序、分组。相同key的value放到一个集合中。 (可选)分组后的数据....

文章 2022-11-27 来自：开发者社区

Hadoop大数据技术课程总结2021-2022学年第1学期（上）

Hadoop大数据技术课程总结1.大数据概述1.1大数据时代的4V数据量大Volume第一个特征是数据量大。大数据的起始计量单位可以达到P(1000个T)、E(100万个T)或Z(10亿个T)级别。类型繁多(Variety)第二个特征是数据类型繁多。包括网络日志、音频、视频、图片、地理位置信息等等，多类型的数据对数据的处理能力提出了更高的要求。价值密度低(Value)第三个特征是数据价值密度相对....

文章 2022-09-03 来自：开发者社区

CentOS 6.X Hadoop 2.7 分布式集群环境搭建 -- 适用于四川信息职业技术学院“Hadoop应用基础教程”课程

前言此教程适用于四川信息职业技术学院"Hadoop应用基础教程"一课，环境为CentOS 6.X系统，Namenode节点一台+Datanode节点2台，但是如果您的Hadoop集群需求与文章内的环境差别不大，亦可参考。环境准备装有 CentOS 6.X 32位系统的虚拟机或服务器 3 台（最好是全新安装的干净系统）Internet网络SSH连接软件（如Xshell、FinalShell等）集群....

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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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立即开通

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StarRocks 免费试用

产品入门

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常见问题

最佳实践

EMR实时计算实践