【快速入门大数据】hadoop和它的hdfs、yarn、mapreduce

心已赠人 2022-12-10 04:57 129阅读 0赞

### 文章目录 ###

*  导学
 *  大数据概述
 *  初识Hadoop
 *   *  概述
     *  核心组件
     *   *  HDFS分布式文件系统
         *  资源调度系统YARN
     *  MapReduce
     *  优势
     *  发展史
     *  生态系统
     *  发行版本选择
     *  企业应用案例
 *  第3章 分布式文件系统HDFS
 *   *  设计分布式文件系统
     *  架构
     *  副本机制
     *  环境搭建
     *   *  Mac上的仿xshell
         *  CDH版-hadoop
         *  jdk
         *  ssh免密登录
         *  解决ifconfig命令失效
         *  解决ssh报错
         *  hadoop
         *  hdfs配置伪分布式1个节点
         *  启动hdfs
         *  停止hdfs
     *  HDFS 常用shell指令
     *   *  配置hadoop/bin环境变量
         *  指令帮助
         *  前提环境-启动hdfs
         *  本地上传文件到hdfs
         *  HDFS创建递归文件夹-p
         *  递归查看文件夹lsr
         *  HDFS文件下载到本地 -get
         *  HDFS删除文件，文件夹
         *  通过页面浏览128M的分块
         *  配置Mac本地host映射
     *  Java-API操作HDFS文件
     *   *  host映射
         *  开发环境
         *  Java-API
         *  解决角色不同，不可写
         *  解决由于hdfs安全模式无法操作
         *  HDFS-JavaAPI增删改查
     *  HDFS读写流程
     *   *  写数据
         *  读数据
         *  HDFS优缺点
     *  总结
 *  第4章 分布式资源调度YARN
 *   *   *  产生背景
         *  概述
     *  架构
     *  执行流程
     *   *  环境搭建
         *  提交作业mr到yarn
     *  总结
 *  第5章 分布式计算框架MapReduce
 *   *  概述
     *  WorldCount词频统计案例
     *  编程模型
     *  map和reduce执行流程
     *  架构
     *   *  1.x
         *  2.x
     *  Java写WordCount
     *   *  JAVA代码
         *  手动删除
         *  java自动删除
     *  MapReduce编程之Combiner
     *  MapReduce之Partitioner
     *  MapReduce配置history
     *   *  解决聚合没有打开 log无法查看
 *  第6章 Hadoop项目实战

# 导学 #

开发环境  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center]  
学做镜像  
![在这里插入图片描述][20200924084157378.png_pic_center]  
生态圈  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 1]  
目录  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 2]  
实战  
分析客户端登录日志

与spring结合使用

扩展及新技术  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 3]

# 大数据概述 #

场景  
足球预判分析人物特性  
购物推荐

来源  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 4]

4v特征  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 5]

量大、种类多、价值密度低、速度快  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 6]

技术  
采集-存储-分析-可视化

技术架构挑战  
量大，无法用结构化数据库，关系型数据库  
经典数据库没有考虑数据多类别 比如json  
实时性的技术挑战  
网络架构、数据中心、运维挑战

其他挑战  
数据隐私

如何对大数据存储和分析  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 7]  
谷歌可以支持pc机处理，成本低。但容错要处理特别好。只有技术论文，没有技术实现

hadoop技术实现  
mr mr  
bigtable hbase  
gfs hdfs

学习  
官网-英文-实战-社区活动-动手练习-持续

# 初识Hadoop #

## 概述 ##

名字源于孩子玩具hadoop

官网  
[http://hadoop.apache.org/][http_hadoop.apache.org]

开源、分布式存储+计算、可扩展  
![在这里插入图片描述][20200924091825382.png_pic_center]

## 核心组件 ##

### HDFS分布式文件系统 ###

扩展、容错（副本）、海量存储  
128m数据块  
![在这里插入图片描述][20200924094550390.png_pic_center]  
文件-分块-备份 （编号）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 8]

### 资源调度系统YARN ###

![在这里插入图片描述][20200924101337114.png_pic_center]  
Hadoop1.x只支持rm，但Hadoop2.x通过Yarn支持其他（spark）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 9]

## MapReduce ##

![在这里插入图片描述][20200924101629480.png_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 10]  
shuffing重新洗牌，把相同的key分到一个地方

## 优势 ##

![在这里插入图片描述][20200924102316318.png_pic_center]  
![在这里插入图片描述][20200924102351807.png_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 11]

## 发展史 ##

infoq.com  
[https://www.infoq.cn/article/hadoop-ten-years-interpretation-and-development-forecast][https_www.infoq.cn_article_hadoop-ten-years-interpretation-and-development-forecast]

谷歌  
Apache hadoop开源 2006， 900节点1T 209秒 世界最快 2008 商业化公司 首Hadoop发行版 《权威指南》2009  
Hbse、Pig、Hive、Zookeep脱离Hadoop成为Apache顶级项目  
Spark逐渐代替MR成为Hadoop执行引擎 2014  
![在这里插入图片描述][20200924103634669.png_pic_center]  
IBM-基于hadoop数据分析软件  
移动-大云 研究hadoop  
阿里-云梯 处理电子商务数据  
Mapr公司 推出mapr和分布式文件系统

现在Hadoop3.x

## 生态系统 ##

![在这里插入图片描述][20200924104313378.png_pic_center]  
![在这里插入图片描述][2020092410431999.png_pic_center]  
有hadoop不够，mr只能实现离线批处理，但如果还要实时计算还需要生态系统的其他玩家 spark  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 12]  
39.47  
hive: sql->mr 适用离线文件分析  
R 统计分析  
Mathout深度学习 往spark方向去了，底层mr不更新了  
pig脚本->mr 适合离线分析  
Oozie 依赖关系工作流  
Zookeeper分布式协调管理多组件 （Hbase单点故障问题）  
Flume分布式日志收集  
Sqoop传统数据库和hadoop数据传输  
Hbase结构化可伸缩的存储数据库 实时查询数据 快查（s级别上）

## 发行版本选择 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 13]  
解决jar包冲突  
商业按照  
CDH提供cm码，浏览器下一步安装，文档丰富，Spark合作，cm不开源可能有坑  
[https://archive.cloudera.com/cdh5/cdh/5/][https_archive.cloudera.com_cdh5_cdh_5]  
选择尾缀相同的tar.gz cdh  
![在这里插入图片描述][20200924155636884.png_pic_center]

HDP安装和升级，添加和删除节点比较费劲  
CDH >HDP > Apache

## 企业应用案例 ##

预测发货 亚马逊  
构建购买人群模型，发邮件 怀孕  
啤酒和尿布

# 第3章 分布式文件系统HDFS #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 14]

## 设计分布式文件系统 ##

## 架构 ##

## 副本机制 ##

分块-副本不同节点上  
hdfs不支持多并发写。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 18]  
副本存放策略  
先同机架，后不同机架。为了安全应该最少一个机架  
副本挂掉之后可以到另一个机架获取  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 19]

## 环境搭建 ##

hadoop  
java-jdk  
mysql  
![在这里插入图片描述][20200925104143183.png_pic_center]\#\#\# 关闭防火墙

设置防火墙
    查看防火墙状态
    systemctl status firewalld.service
    
    停止firewall
    systemctl stop firewalld.service
    
    禁止firewall开机启动
    systemctl disable firewalld.service

### Mac上的仿xshell ###

[https://bennyrhys.blog.csdn.net/article/details/108904326][https_bennyrhys.blog.csdn.net_article_details_108904326]

### CDH版-hadoop ###

cdh版本的hadoop和其他第三方具有稳定性  
[https://archive.cloudera.com/cdh5/cdh/5/][https_archive.cloudera.com_cdh5_cdh_5]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 20]

java环境  
ssh

先搭建伪分布式  
![在这里插入图片描述][20200925105422698.png_pic_center]

### jdk ###

// 解压
    tar -zxvf 待解压文件
    -C 指定目录解压
    // 配置
    vi /etc/profile
    export JAVA_HOME=/root/software/jdk1.8.0_91
    export PATH=$JAVA_HOME/bin:$PATH
    // 刷新
    source /etc/profile
    // 验证
    java -version
    java version "1.8.0_91"
    Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
    Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

![在这里插入图片描述][20200925105452540.png_pic_center]  
tar -zxvf 文件 -C 解压路径

配置环境变量  
![在这里插入图片描述][20200925105642675.png_pic_center]  
![在这里插入图片描述][20200925105658623.png_pic_center]  
验证生效  
source /etc/pro // 也可以这样  
![在这里插入图片描述][20200925105741853.png_pic_center]

### ssh免密登录 ###

如果提示没有可用的软件包，是本机安装的时候就自动安装了

sudo yum install ssh
    没有可用软件包 ssh。
    错误：无须任何处理

![在这里插入图片描述][20200925110419458.png_pic_center]  
![在这里插入图片描述][20200925110506938.png_pic_center]

[root@hadoop01 jdk1.8.0_91]# ssh-keygen -t rsa
    // 连续回车
    // 存储
    Your identification has been saved in /root/.ssh/id_rsa.
    Your public key has been saved in /root/.ssh/id_rsa.pub.
    // 进入存储 .sh查
    [root@hadoop01 ~]# ls -al

.开头目录默认隐藏  
ls -al // 展示.开头文件进入目录  
![在这里插入图片描述][20200925110558177.png_pic_center]

拷贝文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 23]

[root@hadoop01 .ssh]# cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
    [root@hadoop01 .ssh]# cat authorized_keys
    ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDcNTPFpbnrmR3TAp+3Hw8aFpr7uGp88vzCJi3BCn6EIInEIWp0LMgDglDnUx3OJ8/fg2bNKfrukWmcKQUcpLXrXlw0cFsSHM9Jwh1weNgq3JBsS3dfQ8Vu5OdNkOL85PwbL3/K9BdkZcJhtCKEYGuyK20XMgrD+8WHGxtvTXX6G3WstvbuzLU/ex+K1zopjb12z9gJ1tpUZyCShllnU/NbSQMeMPSOKyb2Z18YGF+ienOf1lfklzE9zj4LGgxG5gQQtgmSWrI85sOrBKqCgzBBVYxA2Rh97XKqbJlD9DdOoc0F4kBBBz6i1pJA4jDg8shEpfz/jD8oKunS7UQLQxEt
    root@hadoop01
    
    // 验证登录
    [root@hadoop01 .ssh]# ssh localhost
    The authenticity of host 'localhost (::1)' can't be established. ECDSA key fingerprint is 84:7e:3a:83:2a:8e:26:e3:ba:15:72:36:4b:05:45:d6. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts. Last login: Thu Oct 1 12:13:45 2020 from 192.168.210.1 [root@hadoop01 ~]# exit 登出 // 解决ssh hadoop01 找不到名称 [root@hadoop01 ~]# ssh hadoop01 The authenticity of host 'hadoop01 (::1)' can't be established.
    ECDSA key fingerprint is 84:7e:3a:83:2a:8e:26:e3:ba:15:72:36:4b:05:45:d6.
    Are you sure you want to continue connecting (yes/no)? yes
    Warning: Permanently added 'hadoop01' (ECDSA) to the list of known hosts.
    Last login: Sun Oct  4 02:22:22 2020 from 192.168.210.1
    [root@hadoop01 ~]# exit
    登出
    Connection to hadoop01 closed.
    [root@hadoop01 ~]# ssh hadoop01
    Last login: Sun Oct  4 02:22:32 2020 from localhost
    [root@hadoop01 ~]# exit
    登出
    Connection to hadoop01 closed.

验证是否配置成功  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 24]

### 解决ifconfig命令失效 ###

没有安装ifconfig等命令，运行ifconfig命令就会出错。

解决方法：

yum search ifconfig  
yum install net-tools.x86\_64

### 解决ssh报错 ###

Linux-SSH报错：Could not resolve hostname node1: Name or service not know

#vi /etc/hosts
    127.0.0.1   localhost hadoop01 localhost4 localhost4.localdomain4
    ::1         localhost hadoop01 localhost6 localhost6.localdomain6
    // 重启
    reboot

### hadoop ###

**bin**文件  
客户端  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 25]  
删除所有cmd文件，这是windows上使用的  
![在这里插入图片描述][20200925112622838.png_pic_center]

[root@hadoop01 hadoop-2.6.0-cdh5.7.0]# cd bin
    [root@hadoop01 bin]# ll
    总用量 84
    -rwxr-xr-x. 1 1106 4001  5509 3月  24 2016 hadoop
    -rwxr-xr-x. 1 1106 4001  8298 3月  24 2016 hadoop.cmd
    -rwxr-xr-x. 1 1106 4001 12175 3月  24 2016 hdfs
    -rwxr-xr-x. 1 1106 4001  6915 3月  24 2016 hdfs.cmd
    -rwxr-xr-x. 1 1106 4001  5463 3月  24 2016 mapred
    -rwxr-xr-x. 1 1106 4001  5949 3月  24 2016 mapred.cmd
    -rwxr-xr-x. 1 1106 4001  1776 3月  24 2016 rcc
    -rwxr-xr-x. 1 1106 4001 12176 3月  24 2016 yarn
    -rwxr-xr-x. 1 1106 4001 10895 3月  24 2016 yarn.cmd
    [root@hadoop01 bin]# rm *.cmd
    rm：是否删除普通文件 "hadoop.cmd"？
    rm：是否删除普通文件 "hdfs.cmd"？
    rm：是否删除普通文件 "mapred.cmd"？
    rm：是否删除普通文件 "yarn.cmd"

**etc/hadoop**  
配置文件  
**sbin**  
启动集群的

![在这里插入图片描述][20200925112719449.png_pic_center]  
**hadoop-2.6.0-cdh5.7.0/share/hadoop/mapreduce**  
案例使用  
hadoop-mapreduce-**examples**\-2.6.0-cdh5.7.0.jar  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 26]  
hadoop配置文件的修改  
**etc/hadoop**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 27]

// 获取java位置
    [root@hadoop01 ~]# echo $JAVA_HOME
    /root/software/jdk1.8.0_91
    //修改文件
    hadoop]# vi hadoop-env.sh
    
    # The java implementation to use.
    export JAVA_HOME=/root/software/jdk1.8.0_91

### hdfs配置伪分布式1个节点 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 28]

etc/hadoop/core-site.xml:
    	// hdfs生成目录
    	<property>
            <name>fs.defaultFS</name>
            <value>hdfs://hadoop01:8020</value>
        </property>
        // 解决：临时目录变指定目录hdfs位置(注意创建目录)
        <property>
            <name>hadoop.tmp.dir</name>
            <value>/root/hadoop/tmp</value>
        </property>
        
    
    etc/hadoop/hdfs-site.xml:
        <property>
            <name>dfs.replication</name>
            <value>1</value>
        </property>
    // 集群slave，1个nameNode和多个dateNode
    有多少个dateNode，直接把hostname写到slaves中
    vi slaves
    hadoop01

[root@hadoop01 ~]# mkdir hadoop
    [root@hadoop01 ~]# cd hadoop/
    [root@hadoop01 hadoop]# mkdir tmp
    [root@hadoop01 hadoop]# cd tmp/
    [root@hadoop01 tmp]# ll
    总用量 0
    [root@hadoop01 tmp]# pwd
    /root/hadoop/tmp

### 启动hdfs ###

// hdfs格式化启动（一次启动，不可多次启动）
    $ bin/hdfs namenode -format
    // 过时hadoop改用hdfs
    DEPRECATED: Use of this script to execute hdfs command is deprecated.
    bin]# ./hadoop namenode -format

**2启动hdfs**

Start NameNode daemon and DataNode daemon:
    
      $ sbin/start-dfs.sh
      sbin]# ./start-dfs.sh
      yes
    // 验证1 jps
    [root@hadoop01 sbin]# jps
    2599 DataNode
    2521 NameNode
    2778 SecondaryNameNode
    2890 Jps
    // 假设出现问题追踪日志 out->log 启动时有路径
    sbin]# cat /root/software/hadoop-2.6.0-cdh5.7.0/logs/hadoop-root-namenode-hadoop01.log
    // 验证2 网页
    http://192.168.210.121:50070/

页面可以查看当前活跃节点  
存活的节点信息  
日志目录输出 data name namesecondary

[root@hadoop01 ~]# cd /root/hadoop/tmp/
    [root@hadoop01 tmp]# ll
    总用量 0
    drwxr-xr-x. 5 root root 48 10月  4 06:36 dfs
    [root@hadoop01 tmp]# cd dfs/
    [root@hadoop01 dfs]# ll
    总用量 0
    drwx------. 3 root root 38 10月  4 06:36 data
    drwxr-xr-x. 3 root root 38 10月  4 06:36 name
    drwxr-xr-x. 3 root root 38 10月  4 06:38 namesecondary

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 30]

### 停止hdfs ###

[root@hadoop01 sbin]# ./stop-dfs.sh
    [root@hadoop01 sbin]# jps
    3243 Jps

## HDFS 常用shell指令 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 31]

### 配置hadoop/bin环境变量 ###

vi /etc/profile
    
    export HADOOP_HOME=/root/software/hadoop-2.6.0-cdh5.7.0
    export PATH=$HADOOP_HOME/bin:$PATH
    
    source /etc/profile

### 指令帮助 ###

测试查看指令帮助

hdfs
    Usage: hdfs [--config confdir] COMMAND
           where COMMAND is one of:
      dfs                  run a filesystem command on the file systems supported in Hadoop.
      namenode -format     format the DFS filesystem
      secondarynamenode    run the DFS secondary namenode
      namenode             run the DFS namenode
      journalnode          run the DFS journalnode
      zkfc                 run the ZK Failover Controller daemon
      datanode             run a DFS datanode
      dfsadmin             run a DFS admin client
      haadmin              run a DFS HA admin client
      fsck                 run a DFS filesystem checking utility
      balancer             run a cluster balancing utility
      jmxget               get JMX exported values from NameNode or DataNode.
      mover                run a utility to move block replicas across
                           storage types
      oiv                  apply the offline fsimage viewer to an fsimage
      oiv_legacy           apply the offline fsimage viewer to an legacy fsimage
      oev                  apply the offline edits viewer to an edits file
      fetchdt              fetch a delegation token from the NameNode
      getconf              get config values from configuration
      groups               get the groups which users belong to
      snapshotDiff         diff two snapshots of a directory or diff the
                           current directory contents with a snapshot
      lsSnapshottableDir   list all snapshottable dirs owned by the current user
    						Use -help to see options
      portmap              run a portmap service
      nfs3                 run an NFS version 3 gateway
      cacheadmin           configure the HDFS cache
      crypto               configure HDFS encryption zones
      storagepolicies      list/get/set block storage policies
      version              print the version

提示使用hadoop fs + 参数

[root@hadoop01 bin]# hdfs dfs
    Usage: hadoop fs [generic options]
    	[-appendToFile <localsrc> ... <dst>]
    	[-cat [-ignoreCrc] <src> ...]
    	[-checksum <src> ...]
    	[-chgrp [-R] GROUP PATH...]
    	[-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
    	[-chown [-R] [OWNER][:[GROUP]] PATH...]
    	[-copyFromLocal [-f] [-p] [-l] <localsrc> ... <dst>]
    	[-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
    	[-count [-q] [-h] [-v] <path> ...]
    	[-cp [-f] [-p | -p[topax]] <src> ... <dst>]
    	[-createSnapshot <snapshotDir> [<snapshotName>]]
    	[-deleteSnapshot <snapshotDir> <snapshotName>]
    	[-df [-h] [<path> ...]]
    	[-du [-s] [-h] <path> ...]
    	[-expunge]
    	[-find <path> ... <expression> ...]
    	[-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
    	[-getfacl [-R] <path>]
    	[-getfattr [-R] { -n name | -d} [-e en] <path>]
    	[-getmerge [-nl] <src> <localdst>]
    	[-help [cmd ...]]

### 前提环境-启动hdfs ###

[root@hadoop01 sbin]# ./start-dfs.sh
    [root@hadoop01 sbin]# jps
    3665 DataNode
    3555 NameNode
    3925 Jps
    3822 SecondaryNameNode

### 本地上传文件到hdfs ###

创建本地文件/root/data

[root@hadoop01 ~]# mkdir data
    [root@hadoop01 ~]# cd data/
    [root@hadoop01 data]# vi hello.txt
    
    hello world
    hello hadoop
    hello hdfs

上传文件

[root@hadoop01 ~]# cd /root/data/
    [root@hadoop01 data]# hadoop fs -ls /
    20/10/04 07:29:03 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    [root@hadoop01 data]# hadoop fs -put hello.txt /
    20/10/04 07:29:13 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    [root@hadoop01 data]# hadoop fs -ls /
    20/10/04 07:29:18 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Found 1 items
    -rw-r--r--   1 root supergroup         37 2020-10-04 07:29 /hello.txt
    [root@hadoop01 data]# hadoop fs -cat /hello.txt
    20/10/04 07:30:31 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    hello world
    hello hadoop
    hello hdfs

法2copy

[root@hadoop01 data]# hadoop fs -copyFromLocal hello.txt /hello/a/b/h.txt
    20/10/04 07:39:06 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    [root@hadoop01 data]# hadoop fs -lsr /
    lsr: DEPRECATED: Please use 'ls -R' instead.
    20/10/04 07:39:35 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello/a
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:39 /hello/a/b
    -rw-r--r--   1 root supergroup         37 2020-10-04 07:39 /hello/a/b/h.txt
    -rw-r--r--   1 root supergroup         37 2020-10-04 07:29 /hello.txt
    [root@hadoop01 data]# hadoop fs -cat /hello/a/b/h.txt
    20/10/04 07:39:59 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    hello world
    hello hadoop
    hello hdfs

### HDFS创建递归文件夹-p ###

// mkdir -p 递归创建hdfs上的文件夹
    [root@hadoop01 data]# hadoop fs -mkdir -p /hello/a/b
    20/10/04 07:32:59 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    [root@hadoop01 data]# hadoop fs -ls /
    20/10/04 07:33:07 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Found 2 items
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello
    -rw-r--r--   1 root supergroup         37 2020-10-04 07:29 /hello.txt
    [root@hadoop01 data]# hadoop fs -ls /hello
    20/10/04 07:34:20 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Found 1 items
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello/a
    [root@hadoop01 data]# hadoop fs -ls /hello/a
    20/10/04 07:34:26 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Found 1 items
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello/a/b

### 递归查看文件夹lsr ###

过期建议使用-R

[root@hadoop01 data]# hadoop fs -lsr /
    lsr: DEPRECATED: Please use 'ls -R' instead.
    20/10/04 07:35:28 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello/a
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello/a/b
    -rw-r--r--   1 root supergroup         37 2020-10-04 07:29 /hello.txt

### HDFS文件下载到本地 -get ###

[root@hadoop01 data]# ls
    hello.txt
    [root@hadoop01 data]# hadoop fs -get /hello/a/b/h.txt
    20/10/04 07:41:50 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    [root@hadoop01 data]# ls
    hello.txt  h.txt

### HDFS删除文件，文件夹 ###

// 删除文件rm
    [root@hadoop01 data]# hadoop fs -rm /hello
    20/10/04 07:43:58 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    rm: `/hello': Is a directory
    [root@hadoop01 data]# hadoop fs -rm /hello.txt
    20/10/04 07:44:10 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Deleted /hello.txt
    [root@hadoop01 data]# hadoop fs -ls -R /
    20/10/04 07:44:46 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:32 /hello/a
    drwxr-xr-x   - root supergroup          0 2020-10-04 07:39 /hello/a/b
    -rw-r--r--   1 root supergroup         37 2020-10-04 07:39 /hello/a/b/h.txt
    
    // 删除文件夹必须递归 -R
    [root@hadoop01 data]# hadoop fs -rm -R /hello
    20/10/04 07:45:57 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Deleted /hello
    [root@hadoop01 data]# hadoop fs -ls -R /

### 通过页面浏览128M的分块 ###

http://192.168.210.121:50070/  
上传文件小于128，和大于128的情况

// h可以展示暂用空间
    [root@hadoop01 software]# ls -lh
    总用量 472M
    drwxr-xr-x. 15 1106 4001 4.0K 10月  4 06:35 hadoop-2.6.0-cdh5.7.0
    -rw-r--r--.  1 root root 298M 10月  1 12:28 hadoop-2.6.0-cdh5.7.0.tar.gz
    drwxr-xr-x.  8   10  143 4.0K 4月   1 2016 jdk1.8.0_91
    -rw-r--r--.  1 root root 173M 10月  1 12:29 jdk-8u91-linux-x64.tar.gz
    -rw-r--r--.  1 root root 961K 10月  1 12:28 mysql-connector-java-5.1.38.jar
    [root@hadoop01 software]# hadoop fs -put hadoop-2.6.0-cdh5.7.0.tar.gz /

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 32]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 33]小于128，1块  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 34]大于128，298，分成3块  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 35]

### 配置Mac本地host映射 ###

bennyrhys$ sudo vim /etc/hosts
     # 大数据hadoop测试
    192.168.210.121 hadoop01
    192.168.210.122 hadoop02
    192.168.210.123 hadoop03

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 36]

## Java-API操作HDFS文件 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 37]

### host映射 ###

本地映射

bennyrhys$ vim /etc/hosts
    # 大数据hadoop测试
    192.168.210.121 hadoop01
    192.168.210.122 hadoop02
    192.168.210.123 hadoop03

centos映射  
Centos7和别的版本有点区别

uname -n ：查看host对应的域名

1 先在/etc/hostname 配置想要的域名 默认localhost.localdomain修改hadoop101

2 在/etc/hosts 配置ip和域名映射 192.168.31.101 hadoop101

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    192.168.210.121 hadoop01
    192.168.210.122 hadoop02
    192.168.210.123 hadoop03

### 开发环境 ###

创建本地maven项目  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 38]

指定cdh的本地仓库和url地址（默认没有cdh的包）  
https://repository.cloudera.com/  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 39]cdh版本安装  
[https://repository.cloudera.com/cloudera/webapp/\#/home][https_repository.cloudera.com_cloudera_webapp_home]

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <hadoop.version>2.6.0-cdh5.7.0</hadoop.version>
      </properties>
    
      <repositories>
        <repository>
          <id>cloudera</id>
          <url>https://repository.cloudera.com/artifactory/cloudera-repos/</url>
        </repository>
      </repositories>
    
      <dependencies>
    
    
        <dependency>
          <groupId>org.apache.hadoop</groupId>
          <artifactId>hadoop-client</artifactId>
          <version>${hadoop.version}</version>
        </dependency>
    
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
          <scope>test</scope>
        </dependency>
      </dependencies>

### Java-API ###

注意导入的包  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 40]  
虚拟机配置文件

[root@hadoop01 hadoop]# vi core-site.xml
    <configuration>
        <property>
            <name>fs.defaultFS</name>
            <value>hdfs://192.168.210.121:9000</value>
        </property>
        <property>
            <name>hadoop.tmp.dir</name>
            <value>/root/hadoop/tmp</value>
        </property>
    </configuration>

Java代码

package com.bennyrhys.hadoop.hdfs;
    
    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.fs.FileSystem;
    import org.apache.hadoop.fs.Path;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    
    import java.net.URI;
    
    /**
     * HADDOP HDFS API 操作
     * @Author bennyrhys
     * @Date 2020-10-04 13:34
     */
    public class HDFSApp { 
        public static final String HDFS_PATH = "hdfs://hadoop01:9000";
        FileSystem fileSystem = null;
        Configuration configuration = null;
    
        /**
         * 创建目录
         * @throws Exception
         */
        @Test
        public void mkdir() throws Exception{ 
            /*System.setProperty("HADOOP_USER_NAME","root");
            Configuration conf = new Configuration();
            conf.set("fs.defaultFS", "hdfs://hadoop01:9000");
            conf.set("dfs.replication", "1");
            FileSystem fs = FileSystem.get(conf);
            fs.mkdirs(new Path("/hdfsapi1/test"));*/
    
            fileSystem.mkdirs(new Path("/hdfsapi2/test"));
        }
    
        @Before
        public void setUp() throws Exception { 
            System.out.println("HDFS.setUp");
            configuration = new Configuration();
            fileSystem = FileSystem.get(new URI(HDFS_PATH), configuration, "root");
        }
    
        @After
        public void tearDown() throws Exception { 
            configuration = null;
            fileSystem = null;
            System.out.println("HDFS.tearDown");
        }
    }

验证虚拟机生成文件

[root@hadoop01 hadoop]# hadoop fs -ls -R /
    20/10/04 12:28:34 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    -rw-r--r--   1 root supergroup  311585484 2020-10-04 07:52 /hadoop-2.6.0-cdh5.7.0.tar.gz
    drwxr-xr-x   - root supergroup          0 2020-10-04 12:14 /hdfsapi
    drwxr-xr-x   - root supergroup          0 2020-10-04 12:14 /hdfsapi/test
    -rw-r--r--   1 root supergroup         37 2020-10-04 07:47 /hello.txt

### 解决角色不同，不可写 ###

![在这里插入图片描述][20201004135528237.png_pic_center]`fileSystem = FileSystem.get(new URI(HDFS_PATH), configuration, "root");`

### 解决由于hdfs安全模式无法操作 ###

关闭安全模式

hdfs dfsadmin -safemode leave

### HDFS-JavaAPI增删改查 ###

package com.bennyrhys.hadoop.hdfs;
    
    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.fs.*;
    import org.apache.hadoop.io.IOUtils;
    import org.apache.hadoop.util.Progressable;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    
    import java.io.BufferedInputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.InputStream;
    import java.net.URI;
    
    /** * HADDOP HDFS API 操作 * @Author bennyrhys * @Date 2020-10-04 13:34 */
    public class HDFSApp { 
        public static final String HDFS_PATH = "hdfs://hadoop01:9000";
        FileSystem fileSystem = null;
        Configuration configuration = null;
    
        /** * 创建目录 * @throws Exception */
        @Test
        public void mkdir() throws Exception{ 
            /*System.setProperty("HADOOP_USER_NAME","root"); Configuration conf = new Configuration(); conf.set("fs.defaultFS", "hdfs://hadoop01:9000"); conf.set("dfs.replication", "1"); FileSystem fs = FileSystem.get(conf); fs.mkdirs(new Path("/hdfsapi1/test"));*/
    
            fileSystem.mkdirs(new Path("/hdfsapi2/test"));
        }
    
        /** * 创建一个文件 * @throws Exception */
        @Test
        public void create() throws Exception{ 
            FSDataOutputStream output = fileSystem.create(new Path("/hdfsapi/test/a.txt"));
            output.write("hello world".getBytes());
            output.flush();
            output.close();
        }
    
        /** * 查看文件 */
        @Test
        public void cat() throws Exception{ 
            FSDataInputStream in = fileSystem.open(new Path("/hdfsapi/test/a.txt"));
            IOUtils.copyBytes(in, System.out, 1024);
            in.close();
    
        }
    
        /** * 文件重命名 */
        @Test
        public void rename() throws Exception{ 
            Path oldPath = new Path("/hdfsapi/test/a.txt");
            Path newPath = new Path("/hdfsapi/test/b.txt");
            fileSystem.rename(oldPath, newPath);
        }
    
        /** * 本地上传小文件 */
        @Test
        public void copyFromLocalFile()throws Exception{ 
            Path localPath = new Path("/Users/bennyrhys/Desktop/hello.txt");
            Path targetPath = new Path("/hdfsapi/test/");
            fileSystem.copyFromLocalFile(localPath,targetPath);
        }
        /** * 本地上传大文件 * io流操作 */
        @Test
        public void copyFromLocalFileWithProgess()throws Exception{ 
            /*Path localPath = new Path("/Users/bennyrhys/Desktop/hadoop/hadoop-2.6.0-cdh5.7.0.tar.gz"); Path targetPath = new Path("/hdfsapi/test/"); fileSystem.copyFromLocalFile(localPath,targetPath);*/
    
            //297M ls -lh
            // io 输入
            InputStream in = new BufferedInputStream(
                    new FileInputStream(
                    new File("/Users/bennyrhys/Desktop/hadoop/hadoop-2.6.0-cdh5.7.0.tar.gz")));
            // 输出 进度显示
            FSDataOutputStream out = fileSystem.create(new Path("/hdfsapi/test/hadoop-2.6.0.tar.gz"),
                    new Progressable() { 
                        @Override
                        public void progress() { 
                            System.out.println("."); // 带进度提醒信息
                        }
                    });
    
            IOUtils.copyBytes(in, out, 4096);
    
        }
    
        /** * hdfs下载到本地 * @throws Exception */
        @Test
        public void copyToLocalFile() throws Exception{ 
            Path hdfsPath = new Path("/hdfsapi/test/b.txt");
            Path localPath = new Path("/Users/bennyrhys/Desktop/temp.txt");
            fileSystem.copyToLocalFile(hdfsPath, localPath);
        }
    
        /** * hdfs指定路径的文件信息 * @throws Exception */
        @Test
        public void listStatus() throws Exception { 
            FileStatus[] fileStatuses = fileSystem.listStatus(new Path("/hdfsapi/test/"));
            for (FileStatus fileStatus : fileStatuses) { 
                String isDir = fileStatus.isDirectory() ? "文件夹" : "文件";
                short replication = fileStatus.getReplication(); // 副本数量（hdfs上传有副本预设1，本地没有预设显示3）
                long len = fileStatus.getLen();
                Path path = fileStatus.getPath();
                System.out.println(isDir + "\t" + replication + "\t" + len + "\t" + path);
            }
        }
    
        /** * 删除目录下的文件 * @throws Exception */
        @Test
        public void delete() throws Exception{ 
            fileSystem.delete(new Path("/hdfsapi/test/"), true); // 默认递归删除
        }
    
        @Before
        public void setUp() throws Exception { 
            System.out.println("HDFS.setUp");
            configuration = new Configuration();
            fileSystem = FileSystem.get(new URI(HDFS_PATH), configuration, "root");
        }
    
        @After
        public void tearDown() throws Exception { 
            configuration = null;
            fileSystem = null;
            System.out.println("HDFS.tearDown");
        }
    }

## HDFS读写流程 ##

### 写数据 ###

NameNode(全局把控，唯一)  
DataNode（数据存储，多个）

客户端请求（默认配置128M的块，3个副本）  
创建副本（流水线串联副本创建）

客户端 分块12M/块  
NameNode 记住每个块，所对应的DataNode存在哪几个副本节点  
DataNode 存储并返回NameNode成功存储

### 读数据 ###

客户端 提供名字  
NameNode 提供名字对应的（多个被拆分的块id，及对应的副本DataNode位置）  
客户端-DataNode获取最近数据

### HDFS优缺点 ###

读写数据有完善的容错机制  
流式数据，一次写入多次读取  
适合大文件存储  
构建在廉价机器上

缺  
低延迟数据访问  
小文件（会暂用内存，NameNode压力也就变大）

## 总结 ##

HDFS架构
    
    1 Master(NameNode/NN)  带 N个Slaves(DataNode/DN)
    HDFS/YARN/HBase
    
    1个文件会被拆分成多个Block
    blocksize：128M
    130M ==> 2个Block： 128M 和 2M
    
    NN：
    1）负责客户端请求的响应
    2）负责元数据（文件的名称、副本系数、Block存放的DN）的管理
    
    DN：
    1）存储用户的文件对应的数据块(Block)
    2）要定期向NN发送心跳信息，汇报本身及其所有的block信息，健康状况
    
    A typical deployment has a dedicated machine that runs only the NameNode software. 
    Each of the other machines in the cluster runs one instance of the DataNode software.
    The architecture does not preclude running multiple DataNodes on the same machine 
    but in a real deployment that is rarely the case.
    
    NameNode + N个DataNode
    建议：NN和DN是部署在不同的节点上
    
    
    replication factor：副本系数、副本因子
    
    All blocks in a file except the last block are the same size
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    Hadoop伪分布式安装步骤
    1）jdk安装
    	解压：tar -zxvf jdk-7u79-linux-x64.tar.gz -C ~/app
    	添加到系统环境变量： ~/.bash_profile
    		export JAVA_HOME=/home/hadoop/app/jdk1.7.0_79
    		export PATH=$JAVA_HOME/bin:$PATH
    	使得环境变量生效： source ~/.bash_profile
    	验证java是否配置成功： java -v
    
    2）安装ssh
    	sudo yum install ssh
    	ssh-keygen -t rsa
    	cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys	
    
    3）下载并解压hadoop
    	下载：直接去cdh网站下载
    	解压：tar -zxvf hadoop-2.6.0-cdh5.7.0.tar.gz -C ~/app
    
    4）hadoop配置文件的修改(hadoop_home/etc/hadoop)
    	hadoop-env.sh
    		export JAVA_HOME=/home/hadoop/app/jdk1.7.0_79
    
    	core-site.xml
    		<property>
    	        <name>fs.defaultFS</name>
    	        <value>hdfs://hadoop000:8020</value>
    	    </property>
    
    	    <property>
    	        <name>hadoop.tmp.dir</name>
    	        <value>/home/hadoop/app/tmp</value>
    	    </property>
    
    	hdfs-site.xml
    		<property>
    	        <name>dfs.replication</name>
    	        <value>1</value>
    	    </property>
    
    	slaves    
    
    5）启动hdfs
    	格式化文件系统（仅第一次执行即可，不要重复执行）：hdfs/hadoop namenode -format
    	启动hdfs: sbin/start-dfs.sh
    	验证是否启动成功：
    		jps
    			DataNode
    			SecondaryNameNode
    			NameNode
    
    		浏览器访问方式： http://hadoop000:50070
    
    6）停止hdfs
    	sbin/stop-dfs.sh 
    
    
    
    Hadoop shell的基本使用
    hdfs dfs
    hadoop fs
    
    
    
    Java API操作HDFS文件
    文件	1	311585484	hdfs://hadoop000:8020/hadoop-2.6.0-cdh5.7.0.tar.gz
    文件夹	0	0	hdfs://hadoop000:8020/hdfsapi
    文件	1	49	hdfs://hadoop000:8020/hello.txt
    文件	1	40762	hdfs://hadoop000:8020/install.log
    
    问题：我们已经在hdfs-site.xml中设置了副本系数为1，为什么此时查询文件看到的3呢？
     如果你是通过hdfs shell的方式put的上去的那么，才采用默认的副本系数1
     如果我们是java api上传上去的，在本地我们并没有手工设置副本系数，所以否则采用的是hadoop自己的副本系数

# 第4章 分布式资源调度YARN #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 41]

### 产生背景 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 42]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 43]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 44]

### 概述 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 45]

## 架构 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 46]

## 执行流程 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 49]

### 环境搭建 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 50]

官网配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 51]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 52]  
告诉mr是跑在yarn上

[https://hadoop.apache.org/][https_hadoop.apache.org]

[https://archive.cloudera.com/cdh5/cdh/5/hadoop-2.6.0-cdh5.7.0/][https_archive.cloudera.com_cdh5_cdh_5_hadoop-2.6.0-cdh5.7.0]  
etc/hadoop/mapred-site.xml:

<configuration>
        <property>
            <name>mapreduce.framework.name</name>
            <value>yarn</value>
        </property>
    </configuration>

etc/hadoop/yarn-site.xml:

<configuration>
        <property>
            <name>yarn.nodemanager.aux-services</name>
            <value>mapreduce_shuffle</value>
        </property>
    </configuration>

启动  
`$ sbin/start-yarn.sh`  
检验  
`http://localhost:8088/`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 53]`jps`

ResourceManager  
NodeManager

停止  
`$ sbin/stop-yarn.sh`

### 提交作业mr到yarn ###

[root@hadoop01 mapreduce]# pwd
    /root/software/hadoop-2.6.0-cdh5.7.0/share/hadoop/mapreduce
    [root@hadoop01 mapreduce]# ll
    总用量 4876
    -rw-r--r--. 1 1106 4001  523960 3月  24 2016 hadoop-mapreduce-client-app-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001  753831 3月  24 2016 hadoop-mapreduce-client-common-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001 1542374 3月  24 2016 hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001  171256 3月  24 2016 hadoop-mapreduce-client-hs-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001   10467 3月  24 2016 hadoop-mapreduce-client-hs-plugins-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001   43777 3月  24 2016 hadoop-mapreduce-client-jobclient-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001 1499926 3月  24 2016 hadoop-mapreduce-client-jobclient-2.6.0-cdh5.7.0-tests.jar
    -rw-r--r--. 1 1106 4001   91087 3月  24 2016 hadoop-mapreduce-client-nativetask-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001   50818 3月  24 2016 hadoop-mapreduce-client-shuffle-2.6.0-cdh5.7.0.jar
    -rw-r--r--. 1 1106 4001  276202 3月  24 2016 hadoop-mapreduce-examples-2.6.0-cdh5.7.0.jar
    drwxr-xr-x. 2 1106 4001    4096 3月  24 2016 lib
    drwxr-xr-x. 2 1106 4001      29 3月  24 2016 lib-examples
    drwxr-xr-x. 2 1106 4001    4096 3月  24 2016 sources
    
    [root@hadoop01 mapreduce]# hadoop jar hadoop-mapreduce-examples-2.6.0-cdh5.7.0.jar pi 2 3

`hadoop jar 包名.jar 方法 参数`

## 总结 ##

Hadoop1.x时：
    MapReduce：Master/Slave架构，1个JobTracker带多个TaskTracker
    
    JobTracker： 负责资源管理和作业调度
    TaskTracker：
    	定期向JT汇报本节点的健康状况、资源使用情况、作业执行情况；
    	接收来自JT的命令：启动任务/杀死任务
    
    YARN：不同计算框架可以共享同一个HDFS集群上的数据，享受整体的资源调度
    
    XXX on YARN的好处：
    	与其他计算框架共享集群资源，按资源需要分配，进而提高集群资源的利用率
    XXX: Spark/MapReduce/Storm/Flink
    
    
    YARN架构：
    1）ResourceManager: RM
    	整个集群同一时间提供服务的RM只有一个，负责集群资源的统一管理和调度
    	处理客户端的请求： 提交一个作业、杀死一个作业
    	监控我们的NM，一旦某个NM挂了，那么该NM上运行的任务需要告诉我们的AM来如何进行处理
    
    2) NodeManager: NM
    	整个集群中有多个，负责自己本身节点资源管理和使用
    	定时向RM汇报本节点的资源使用情况
    	接收并处理来自RM的各种命令：启动Container
    	处理来自AM的命令
    	单个节点的资源管理
    
    3) ApplicationMaster: AM
    	每个应用程序对应一个：MR、Spark，负责应用程序的管理
    	为应用程序向RM申请资源（core、memory），分配给内部task
    	需要与NM通信：启动/停止task，task是运行在container里面，AM也是运行在container里面
    
    4) Container
    	封装了CPU、Memory等资源的一个容器
    	是一个任务运行环境的抽象
    
    5) Client
    	提交作业
    	查询作业的运行进度
    	杀死作业
    
    
    
    
    
    
    YARN环境搭建
    1）mapred-site.xml
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
    
    2）yarn-site.xml
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
    
    3) 启动YARN相关的进程
    sbin/start-yarn.sh
    
    4）验证
    	jps
    		ResourceManager
    		NodeManager
    	http://hadoop000:8088
    
    5）停止YARN相关的进程
    	sbin/stop-yarn.sh
    
    
    提交mr作业到YARN上运行：
    /home/hadoop/app/hadoop-2.6.0-cdh5.7.0/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.0-cdh5.7.0.jar
    
    hadoop jar 
    
    hadoop jar hadoop-mapreduce-examples-2.6.0-cdh5.7.0.jar pi 2 3

# 第5章 分布式计算框架MapReduce #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 54]

## 概述 ##

## WorldCount词频统计案例 ##

![在这里插入图片描述][20201009170918892.png_pic_center]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 57]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 58]

## 编程模型 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 59]

## map和reduce执行流程 ##

序列化、比较 接口  
整个过程就是kv形式，记录偏移量 长度  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 62]  
Format  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 63]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 64]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 65][]  
拆分split，默认和block128M是对应的  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 66]  
记录读取器，读取每一行  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 67]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 68]

## 架构 ##

### 1.x ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 69]

MapReduce1.x的架构
    1）JobTracker: JT
    	作业的管理者      管理的
    	将作业分解成一堆的任务：Task（MapTask和ReduceTask）
    	将任务分派给TaskTracker运行
    	作业的监控、容错处理（task作业挂了，重启task的机制）
    	在一定的时间间隔内，JT没有收到TT的心跳信息，TT可能是挂了，TT上运行的任务会被指派到其他TT上去执行
    
    2）TaskTracker: TT
    	任务的执行者      干活的
    	在TT上执行我们的Task（MapTask和ReduceTask）
    	会与JT进行交互：执行/启动/停止作业，发送心跳信息给JT
    
    3）MapTask
    	自己开发的map任务交由该Task出来
    	解析每条记录的数据，交给自己的map方法处理
    	将map的输出结果写到本地磁盘（有些作业只仅有map没有reduce==>HDFS）
    
    4）ReduceTask
    	将Map Task输出的数据进行读取
    	按照数据进行分组传给我们自己编写的reduce方法处理
    	输出结果写到HDFS

### 2.x ###

申请Node资源,获取信息，启动指定Node的Container  
方便扩充第三方的spark  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 70]

## Java写WordCount ##

选择新版本的Mapper  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 71]

### JAVA代码 ###

package com.bennyrhys.hadoop.mapreduce;
    
    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.fs.Path;
    import org.apache.hadoop.io.LongWritable;
    import org.apache.hadoop.io.Text;
    import org.apache.hadoop.mapreduce.Job;
    import org.apache.hadoop.mapreduce.Mapper;
    import org.apache.hadoop.mapreduce.Reducer;
    import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
    import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
    
    import java.io.IOException;
    
    /** * @Author bennyrhys * @Date 2020-10-09 23:39 * 使用MapReduce开发WordCount */
    public class WordCount { 
        /** * Map:输入文件 * Text当成Java中的字符串 */
        public static class MyMapper extends Mapper<LongWritable, Text, Text, LongWritable> { 
            LongWritable one = new LongWritable(1);
    
            @Override
            protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { 
                // 接收一行指定数据
                String line = value.toString();
                // 根据指定字符进行分割
                String[] words = line.split(" ");
                for (String word : words) { 
                    // 通过上下文，将分割的map赋值v=1，处理结果输出
                    context.write(new Text(word), one);
                }
            }
        }
    
        public static class MyReduce extends Reducer<Text, LongWritable, Text, LongWritable> { 
            @Override
            protected void reduce(Text key, Iterable<LongWritable> values, Context context) throws IOException, InterruptedException { 
                long sum = 0;
                for (LongWritable value : values) { 
                    // LongWritable -> java类型 .get
                    // 求key出现次数的总和
                    sum += value.get();
                 }
                // 求最后统计结果的输出
                context.write(key, new LongWritable(sum));
            }
        }
    
        /** * Driver: 封装MapReduce */
        public static void main(String[] args) throws Exception { 
            // 创建 hadoop 的configuration
            Configuration configuration = new Configuration();
            // 创建 job
            Job job = Job.getInstance(configuration, "wordcount");
            // 设置job的处理类
            job.setJarByClass(WordCount.class);
            // 设置作业处理的输入路径
            FileInputFormat.setInputPaths(job, new Path(args[0]));
    
            // 设置map参数
            job.setMapperClass(MyMapper.class);
            job.setMapOutputKeyClass(Text.class);
            job.setMapOutputValueClass(LongWritable.class);
    
            // 设置reduce参数
            job.setReducerClass(MyReduce.class);
            job.setOutputKeyClass(Text.class);
            job.setOutputValueClass(LongWritable.class);
    
            // 设置作业处理的输出路径
            FileOutputFormat.setOutputPath(job, new Path(args[1]));
    
            System.exit(job.waitForCompletion(true) ? 0 : 1);
    
    
        }
    }

本地打jar包  
clean-》package，在target里面找到  
![在这里插入图片描述][20201010204847416.png_pic_center]本地上传到服务器

scp hdfs-api-1.0-SNAPSHOT.jar root@hadoop01:~/lib

确保hello.txt文件在hdfs上

[root@hadoop01 data]# hadoop fs -cat /hello.txt
    20/10/05 14:54:25 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    hello world
    hello hadoop
    hello hdfs

启动

[root@hadoop01 data]# hadoop jar /root/data/hdfs-api-1.0-SNAPSHOT.jar com.bennyrhys.hadoop.mapreduce.WordCount hdfs://hadoop01:9000/hello.txt hdfs://hadoop01:9000/output/wc

检验输出wc在hdfs上

[root@hadoop01 data]# hadoop fs -lsr /output/wc
    lsr: DEPRECATED: Please use 'ls -R' instead.
    20/10/05 15:00:19 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    -rw-r--r--   1 root supergroup          0 2020-10-05 14:57 /output/wc/_SUCCESS
    -rw-r--r--   1 root supergroup         35 2020-10-05 14:57 /output/wc/part-r-00000
    [root@hadoop01 data]# hadoop fs -cat /output/wc/part-r-00000
    20/10/05 15:00:39 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    	1
    hadoop	1
    hdfs	1
    hello	3
    world	1

### 手动删除 ###

防止重复执行文件，形成重复输出的报错  
写脚本，先删除输出文件在执行

// 改变执行权限 -rw-r--r--.  变成 -rwxr--r--
    chmod u+x wc_rm.sh
     ./wc_rm.sh

### java自动删除 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 72]

## MapReduce编程之Combiner ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 73]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 74]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 75]

**场景**

Combiner
    hadoop jar /home/hadoop/lib/hadoop-train-1.0.jar com.imooc.hadoop.mapreduce.CombinerApp hdfs://hadoop000:8020/hello.txt hdfs://hadoop000:8020/output/wc
    
    使用场景：
    	求和、次数   + 
    	平均数  X

验证生效  
运行的屏幕输出  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 76]

## MapReduce之Partitioner ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 79]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 80]检验四个partation  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 81]

## MapReduce配置history ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 82]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 83]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 84]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 85]  
重启yarn  
启动jobhistory  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 86][]

jps可以验证  
hdfs输出文件验证  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 87]

### 解决聚合没有打开 log无法查看 ###

yarn开启聚合 修改配置文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 88]

其中包含了生成hdfs的保存的路径  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 89]

wordcount: 统计文件中每个单词出现的次数
    
    需求：求wc
    1) 文件内容小：shell
    2）文件内容很大： TB GB   ???? 如何解决大数据量的统计分析
    
    ==> url TOPN <== wc的延伸 
    工作中很多场景的开发都是wc的基础上进行改造的
    
    
    借助于分布式计算框架来解决了： mapreduce
    
    分而治之
    
    
    
    
    (input) <k1, v1> -> map -> <k2, v2> -> combine -> <k2, v2> -> reduce -> <k3, v3> (output)
    
    核心概念
    Split：交由MapReduce作业来处理的数据块，是MapReduce中最小的计算单元
    	HDFS：blocksize 是HDFS中最小的存储单元  128M
    	默认情况下：他们两是一一对应的，当然我们也可以手工设置他们之间的关系（不建议）
    
    
    InputFormat：
    	将我们的输入数据进行分片(split):  InputSplit[] getSplits(JobConf job, int numSplits) throws IOException;
    	TextInputFormat: 处理文本格式的数据
    
    OutputFormat: 输出
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    MapReduce1.x的架构
    1）JobTracker: JT
    	作业的管理者      管理的
    	将作业分解成一堆的任务：Task（MapTask和ReduceTask）
    	将任务分派给TaskTracker运行
    	作业的监控、容错处理（task作业挂了，重启task的机制）
    	在一定的时间间隔内，JT没有收到TT的心跳信息，TT可能是挂了，TT上运行的任务会被指派到其他TT上去执行
    
    2）TaskTracker: TT
    	任务的执行者      干活的
    	在TT上执行我们的Task（MapTask和ReduceTask）
    	会与JT进行交互：执行/启动/停止作业，发送心跳信息给JT
    
    3）MapTask
    	自己开发的map任务交由该Task出来
    	解析每条记录的数据，交给自己的map方法处理
    	将map的输出结果写到本地磁盘（有些作业只仅有map没有reduce==>HDFS）
    
    4）ReduceTask
    	将Map Task输出的数据进行读取
    	按照数据进行分组传给我们自己编写的reduce方法处理
    	输出结果写到HDFS
    
    
    
    
    
    使用IDEA+Maven开发wc：
    1）开发
    2）编译：mvn clean package -DskipTests
    3）上传到服务器：scp target/hadoop-train-1.0.jar hadoop@hadoop000:~/lib
    4）运行
    	hadoop jar /home/hadoop/lib/hadoop-train-1.0.jar com.imooc.hadoop.mapreduce.WordCountApp hdfs://hadoop000:8020/hello.txt hdfs://hadoop000:8020/output/wc
    
    	相同的代码和脚本再次执行，会报错
    	security.UserGroupInformation:
    	PriviledgedActionException as:hadoop (auth:SIMPLE) cause:
    	org.apache.hadoop.mapred.FileAlreadyExistsException: 
    	Output directory hdfs://hadoop000:8020/output/wc already exists
    	Exception in thread "main" org.apache.hadoop.mapred.FileAlreadyExistsException: 
    	Output directory hdfs://hadoop000:8020/output/wc already exists
    
    	在MR中，输出文件是不能事先存在的
    	1）先手工通过shell的方式将输出文件夹先删除
    		hadoop fs -rm -r /output/wc
    	2) 在代码中完成自动删除功能: 推荐大家使用这种方式
    	    Path outputPath = new Path(args[1]);
    	    FileSystem fileSystem = FileSystem.get(configuration);
    	    if(fileSystem.exists(outputPath)){ 
    	        fileSystem.delete(outputPath, true);
    	        System.out.println("output file exists, but is has deleted");
    	    }
    
    
    
    Combiner
    hadoop jar /home/hadoop/lib/hadoop-train-1.0.jar com.imooc.hadoop.mapreduce.CombinerApp hdfs://hadoop000:8020/hello.txt hdfs://hadoop000:8020/output/wc
    
    使用场景：
    	求和、次数   + 
    	平均数  X
    
    
    
    Partitioner
    hadoop jar /home/hadoop/lib/hadoop-train-1.0.jar com.imooc.hadoop.mapreduce.ParititonerApp hdfs://hadoop000:8020/partitioner hdfs://hadoop000:8020/output/partitioner

# 第6章 Hadoop项目实战 #

【大数据】Hadoop项目实战-用户行为日志

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[http_hadoop.apache.org]: http://hadoop.apache.org/
[20200924091825382.png_pic_center]: /images/20221123/9c3e7dc5f28349259eaddec80afb8d84.png
[20200924094550390.png_pic_center]: /images/20221123/e3cf6b907fe447b5bd98f87b85445fb9.png
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[20200924101337114.png_pic_center]: /images/20221123/09d80292c7cd459795c62848e5a4083f.png
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[20200924101629480.png_pic_center]: /images/20221123/e133a2b8d849463c8d44447b9cd0546b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ2OTY4MA_size_16_color_FFFFFF_t_70_pic_center 10]: /images/20221123/4db57583318e43b9940d4afd04efb9bd.png
[20200924102316318.png_pic_center]: /images/20221123/40f721a04a6f4313ae57a101912cb987.png
[20200924102351807.png_pic_center]: /images/20221123/22416ea3c81545fc9ebaed57e45b2095.png
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[https_www.infoq.cn_article_hadoop-ten-years-interpretation-and-development-forecast]: https://www.infoq.cn/article/hadoop-ten-years-interpretation-and-development-forecast
[20200924103634669.png_pic_center]: /images/20221123/104c84f6059d4e2880aba6cb1a7fd05f.png
[20200924104313378.png_pic_center]: /images/20221123/c2f49165f5f846778084fc5b68d12891.png
[2020092410431999.png_pic_center]: /images/20221123/0bcca83665044729b721d77a6a0fbb68.png
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[https_archive.cloudera.com_cdh5_cdh_5]: https://archive.cloudera.com/cdh5/cdh/5/
[20200924155636884.png_pic_center]: /images/20221123/a3f87dab46514552b39cc5a619581880.png
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[https_bennyrhys.blog.csdn.net_article_details_108904326]: https://bennyrhys.blog.csdn.net/article/details/108904326
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[https_repository.cloudera.com_cloudera_webapp_home]: https://repository.cloudera.com/cloudera/webapp/#/home
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[https_hadoop.apache.org]: https://hadoop.apache.org/
[https_archive.cloudera.com_cdh5_cdh_5_hadoop-2.6.0-cdh5.7.0]: https://archive.cloudera.com/cdh5/cdh/5/hadoop-2.6.0-cdh5.7.0/
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