开源大数据平台 E-MapReduce学习的相关内容

Hadoop学习：MapReduce不使用Reduce将表合并提高效率

一、✌题目要求record表：ID城市编号空气指数001032450020265500305743004042460050295600601637007058310080368300902349city表：城市编号城市名称01长沙02株洲03湘潭04怀化05岳阳目标表：ID城市名称空气指数001湘潭...

Hadoop MapReduce 保姆级吐血宝典，学习与面试必读此文！（三）

8. Map端实现 JOIN8.1 概述适用于关联表中有小表的情形.使用分布式缓存,可以将小表分发到所有的map节点，这样，map节点就可以在本地对自己所读到的大表数据进行join并输出最终结果，可以大大提高join操作的并发度，加快处理速度8.2 实现步骤先在mapper类中预先定义好小表，进行j...

Hadoop MapReduce 保姆级吐血宝典，学习与面试必读此文！（二）

6. MapReduce的运行机制详解6.1 MapTask 工作机制整个Map阶段流程大体如上图所示。简单概述：inputFile通过split被逻辑切分为多个split文件，通过Record按行读取内容给map（用户自己实现的）进行处理，数据被map处理结束之后交给OutputCollector...

Hadoop MapReduce 保姆级吐血宝典，学习与面试必读此文！（一）

Hadoop 涉及的知识点如下图所示，本文将逐一讲解：本文档参考了关于 Hadoop 的官网及其他众多资料整理而成，为了整洁的排版及舒适的阅读，对于模糊不清晰的图片及黑白图片进行重新绘制成了高清彩图。目前企业应用较多的是Hadoop2.x，所以本文是以Hadoop2.x为主，对于Hadoop3.x新...

一脸懵逼学习Hive的安装（将sql语句翻译成MapReduce程序的一个工具）

Hive只在一个节点上安装即可： 1.上传tar包：这个上传就不贴图了，贴一下上传后的，看一下虚拟机吧： 2.解压操作： [root@slaver3 hadoop]# tar -zxvf hive-0.12.0.tar.gz 解压后贴一下图： 3：解压缩以后启动一下hive： ...

一脸懵逼学习Hadoop中的MapReduce程序中自定义分组的实现

1：首先搞好实体类对象：　　write 是把每个对象序列化到输出流，readFields是把输入流字节反序列化，实现WritableComparable，Java值对象的比较：一般需要重写toString(),hashCode(),equals()方法 1 package com.areapart...

一脸懵逼学习Hadoop中的序列化机制——流量求和统计MapReduce的程序开发案例——流量求和统计排序

一：序列化概念序列化（Serialization）是指把结构化对象转化为字节流。反序列化（Deserialization）是序列化的逆过程。即把字节流转回结构化对象。Java序列化（java.io.Serializable）二：Hadoop序列化的特点（1）：序列化格式特点：　　紧凑：高效使用...

共有30条

< 1 2 3 >

跳转至： GO

更新时间 2023-08-04 21:41:53

本页面内关键词为智能算法引擎基于机器学习所生成，如有任何问题，可在页面下方点击"联系我们"与我们沟通。

产品推荐

{"moduleinfo":{"card_count":[{"count_phone":1,"count":1}],"search_count":[{"count_phone":3,"count":3}]},"card":[{"des":"E-MapReduce 是构建于阿里云ECS弹性虚拟机之上，利用开源大数据生态系统，包括Hadoop，Spark，Kafka，Storm，为用户提供集群，作业，数据等管理的一站式大数据处理分析业务。","link1":"https://www.aliyun.com/product/emapreduce","link":"https://www.aliyun.com/product/emapreduce","icon":"https://img.alicdn.com/tfs/TB10yI6DNn1gK0jSZKPXXXvUXXa-201-200.png","btn2":"产品文档","tip":"海量存储，离线计算，实时计算场景等各种场景，Hadoop，Spark，Hive，Kafka，Storm等集群快速购买，<a href=\"https://www.aliyun.com/product/emapreduce\" target=\"_blank\">立即查看</a>产品动态发布：<a href=\"https://www.aliyun.com/product/new\" target=\"_blank\">立即查看</a>","btn1":"立即开通","link2":"https://help.aliyun.com/document_detail/28068.html","title":"E-MapReduce"}],"search":[{"txt":"购买建议","link":"https://help.aliyun.com/document_detail/65683.html"},{"txt":"集群规划","link":"https://help.aliyun.com/document_detail/58901.html"},{"txt":"Spark开发入门","link":"https://help.aliyun.com/document_detail/28116.html"},{"txt":"快速入门","link":"https://help.aliyun.com/document_detail/43753.html"},{"txt":"产品动态","link":"https://www.aliyun.com/product/new"}],"countinfo":{"search":{"length_pc":0,"length":0},"card":{"length_pc":0,"length":0}},"simplifiedDisplay":"newEdition","newCard":[{"link":"https://www.aliyun.com/product/emapreduce","icon":"emapreduce","contentLink":"https://www.aliyun.com/product/emapreduce?spm=5176.19720258.J_8058803260.198.4d7a2c4aDND26z","title":"开源大数据平台 E-MapReduce","des":"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。","btn1":"产品控制台","link1":"https://emr-next.console.aliyun.com/","btn2":"立即开通","link2":"https://emr-next.console.aliyun.com/#/create/ecs","btn3":"产品文档","link3":"https://help.aliyun.com/document_detail/28068.html","infoGroup":[{"infoName":"优惠活动","infoContent":{"firstContentName":"StarRocks 免费试用","firstContentLink":"https://free.aliyun.com/?pipCode=emapreduce&spm=5176.28055625.J_4VYgf18xNlTAyFFbOuOQe.118.e939154awRTC1N&scm=20140722.M_9821919._.V_1"}},{"infoName":"产品入门","infoContent":{"firstContentName":"快速入门指导","firstContentLink":"https://help.aliyun.com/document_detail/176795.html?spm=a2c4g.11186623.6.572.68403b8bI3rak8","lastContentName":"常见问题","lastContentLink":"https://help.aliyun.com/document_detail/28186.html?spm=a2c4g.11186623.6.1143.7bce1c52WiJTBt"}},{"infoName":"最佳实践","infoContent":{"firstContentName":"EMR实时计算实践","firstContentLink":"https://help.aliyun.com/document_detail/127198.html?spm=5176.cnemapreduce.0.0.3dd23a1cfXWfSP","lastContentName":"EMR弹性计算实践","lastContentLink":"https://bp.aliyun.com/front/home/detail/36?spm=5176.cnemapreduce.0.0.3dd23a1cfXWfSP"}},{"infoContent":{"lastContentName":"","lastContentLink":"","firstContentName":"产品最新动态","firstContentLink":"https://www.aliyun.com/product/new?category=19&product=125"},"infoName":"最新动态"}],"ifIcon":"icon","iconImg":"https://img.alicdn.com/tfs/TB1XY8hGYr1gK0jSZFDXXb9yVXa-1740-328.png"}]}

{"$env":{"JSON":{}},"$page":{"env":"production"},"$context":{"moduleinfo":{"card_count":[{"count_phone":1,"count":1}],"search_count":[{"count_phone":3,"count":3}]},"card":[{"des":"E-MapReduce 是构建于阿里云ECS弹性虚拟机之上，利用开源大数据生态系统，包括Hadoop，Spark，Kafka，Storm，为用户提供集群，作业，数据等管理的一站式大数据处理分析业务。","link1":"https://www.aliyun.com/product/emapreduce","link":"https://www.aliyun.com/product/emapreduce","icon":"https://img.alicdn.com/tfs/TB10yI6DNn1gK0jSZKPXXXvUXXa-201-200.png","btn2":"产品文档","tip":"海量存储，离线计算，实时计算场景等各种场景，Hadoop，Spark，Hive，Kafka，Storm等集群快速购买，<a href=\"https://www.aliyun.com/product/emapreduce\" target=\"_blank\">立即查看</a>产品动态发布：<a href=\"https://www.aliyun.com/product/new\" target=\"_blank\">立即查看</a>","btn1":"立即开通","link2":"https://help.aliyun.com/document_detail/28068.html","title":"E-MapReduce"}],"search":[{"txt":"购买建议","link":"https://help.aliyun.com/document_detail/65683.html"},{"txt":"集群规划","link":"https://help.aliyun.com/document_detail/58901.html"},{"txt":"Spark开发入门","link":"https://help.aliyun.com/document_detail/28116.html"},{"txt":"快速入门","link":"https://help.aliyun.com/document_detail/43753.html"},{"txt":"产品动态","link":"https://www.aliyun.com/product/new"}],"countinfo":{"search":{"length_pc":0,"length":0},"card":{"length_pc":0,"length":0}},"simplifiedDisplay":"newEdition","newCard":[{"link":"https://www.aliyun.com/product/emapreduce","icon":"emapreduce","contentLink":"https://www.aliyun.com/product/emapreduce?spm=5176.19720258.J_8058803260.198.4d7a2c4aDND26z","title":"开源大数据平台 E-MapReduce","des":"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。","btn1":"产品控制台","link1":"https://emr-next.console.aliyun.com/","btn2":"立即开通","link2":"https://emr-next.console.aliyun.com/#/create/ecs","btn3":"产品文档","link3":"https://help.aliyun.com/document_detail/28068.html","infoGroup":[{"infoName":"优惠活动","infoContent":{"firstContentName":"StarRocks 免费试用","firstContentLink":"https://free.aliyun.com/?pipCode=emapreduce&spm=5176.28055625.J_4VYgf18xNlTAyFFbOuOQe.118.e939154awRTC1N&scm=20140722.M_9821919._.V_1"}},{"infoName":"产品入门","infoContent":{"firstContentName":"快速入门指导","firstContentLink":"https://help.aliyun.com/document_detail/176795.html?spm=a2c4g.11186623.6.572.68403b8bI3rak8","lastContentName":"常见问题","lastContentLink":"https://help.aliyun.com/document_detail/28186.html?spm=a2c4g.11186623.6.1143.7bce1c52WiJTBt"}},{"infoName":"最佳实践","infoContent":{"firstContentName":"EMR实时计算实践","firstContentLink":"https://help.aliyun.com/document_detail/127198.html?spm=5176.cnemapreduce.0.0.3dd23a1cfXWfSP","lastContentName":"EMR弹性计算实践","lastContentLink":"https://bp.aliyun.com/front/home/detail/36?spm=5176.cnemapreduce.0.0.3dd23a1cfXWfSP"}},{"infoContent":{"lastContentName":"","lastContentLink":"","firstContentName":"产品最新动态","firstContentLink":"https://www.aliyun.com/product/new?category=19&product=125"},"infoName":"最新动态"}],"ifIcon":"icon","iconImg":"https://img.alicdn.com/tfs/TB1XY8hGYr1gK0jSZFDXXb9yVXa-1740-328.png"}]}}

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。

产品控制台

立即开通

产品文档

优惠活动

StarRocks 免费试用

产品入门

快速入门指导

常见问题

最佳实践

EMR实时计算实践