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55页超经典 Hadoop入门实战手册 分析到位 图文并茂 挥泪推荐~! |
55页超经典 Hadoop入门实战手册 分析到位 图文并茂 挥泪推荐~!
文档真心写的不错,推荐给大家,大家看看目录就很清楚了,写的真心不错。 1 概述............................................................................................................................................ 4 1.1 什么是Hadoop?............................................................................................................... 4 1.2 为什么要选择Hadoop?................................................................................................... 5 1.2.1 系统特点....................................................................................................................... 5 1.2.2 使用场景....................................................................................................................... 5 2 术语............................................................................................................................................ 5 3 Hadoop的单机部署..................................................................................................................6 3.1 目的......................................................................................................................................6 3.2 先决条件..............................................................................................................................6 3.2.1 支持平台....................................................................................................................... 6 3.2.2 所需软件....................................................................................................................... 6 3.2.3 安装软件....................................................................................................................... 7 3.3 下载......................................................................................................................................7 3.4 运行Hadoop集群的准备工作............................................................................................7 3.5 单机模式的操作方法......................................................................................................... 7 3.6 伪分布式模式的操作方法................................................................................................. 8 3.6.1 配置............................................................................................................................... 8 3.6.2 免密码ssh设置............................................................................................................. 9 3.6.3 执行............................................................................................................................... 9 4 Hadoop集群搭建过程手记....................................................................................................12 4.1 免密码SSH设置...............................................................................................................12 4.2 Hadoop软件安装............................................................................................................. 12 4.3 Master(85)配置................................................................................................................13 4.4 Slave(60,245上)配置......................................................................................................14 4.5 初始化和启动hadoop集群..............................................................................................15 4.5.1 初始化文件系统.........................................................................................................15 4.5.2 启动Hadoop...............................................................................................................15 4.5.3 停止Hadoop...............................................................................................................17 4.6 测试................................................................................................................................... 17 4.7 管理界面与命令............................................................................................................... 19 4.7.1 hdfs运行状态界面..................................................................................................... 19 4.7.2 Map-reduce的运行状态界面................................................................................... 20 4.7.3 直接的命令行查看.....................................................................................................20 4.7.1 运行的进程查看.........................................................................................................21 5 架构分析..................................................................................................................................23 5.1 HDFS................................................................................................................................ 23 5.1.1 HDFS的三个重要角色..............................................................................................24 5.1.2 HDFS设计特点..........................................................................................................25 5.2 MapReduce......................................................................................................................26 5.2.1 算法介绍.....................................................................................................................26 5.2.2 Hadoop框架下的mapreduce.................................................................................. 28 5.3 综合架构分析................................................................................................................... 29 6 Hadoop的应用........................................................................................................................31 7 系统维护..................................................................................................................................31 7.1 Hadoop的系统监控......................................................................................................... 31 7.2 Hadoop中的命令(Command)总结.......................................................................... 32 7.3 NameNode与JobTracker单点故障说明.......................................................................32 7.4 经验总结........................................................................................................................... 32 7.5 如何在一个hadoop集群新增或删除一些机器而不重启............................................. 33 7.5.1 新增节点.....................................................................................................................33 7.5.2 删除节点.....................................................................................................................34 7.6 其它日常问题说明........................................................................................................... 36 7.6.1 datanode启动失败,各slave节点的namespaceIDs与masters不同.................36 7.6.2 taskTracker和jobTracker 启动失败...................................................................... 37 7.6.3 Shuffle Error: Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out....37 7.6.4 Too many fetch-failures...........................................................................................38 7.6.5 能够启动datanode,但无法访问,也无法结束的错误....................................... 38 7.6.6 java.io.IOException: Could not obtain block:.......................................................38 7.6.7 java.lang.OutOfMemoryError: Java heap space................................................ 38 7.6.8 解决hadoop OutOfMemoryError问题:................................................................39 7.6.9 Hadoop java.io.IOException:..................................................................................39 7.7 防火墙的端口开放要求................................................................................................... 39 7.7.1 与HDFS有关的地址及端口属性............................................................................. 39 7.7.2 与MapReduce 有关的地址及端口属性..................................................................41 8 附录..........................................................................................................................................42 8.1 hadoop历史......................................................................................................................42 8.2 Hadoop大记事................................................................................................................. 43 8.3 Hadoop的几个主要子项目.............................................................................................44 8.4 官方集群搭建参考........................................................................................................... 44 8.4.1 配置文件.....................................................................................................................44 8.4.2 集群配置说明.............................................................................................................44
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