完全分布式Hadoop3.X的搭建

準備作業以及安裝Hadoop之前的操作和Hadoop2.X的安裝相同，在我上一篇博客中，這里不做過多介紹

https://www.cnblogs.com/lmandcc/p/15306163.html

1. 寫一些關鍵腳本，利于后續集群使用

1.1集群分發腳本xsync

cd /bin/

vim xsyn

#!/bin/bash
#1. 判斷引數個數
if [ $# -lt 1 ]
then
  echo Not Enough Arguement!
  exit;
fi
#2. 遍歷集群所有機器
for host in hadoop102 hadoop103 hadoop104
do
 echo ====================  $host  ====================
  #3. 遍歷所有目錄，挨個發送
  for file in $@
  do
    #4. 判斷檔案是否存在
    if [ -e $file ]
    then
      #5. 獲取父目錄
      pdir=$(cd -P $(dirname $file); pwd)
      #6. 獲取當前檔案的名稱
      fname=$(basename $file)
      ssh $host "mkdir -p $pdir"
      rsync -av $pdir/$fname $host:$pdir
    else
      echo $file does not exists!
    fi
  done
done

1.2 查看節點Java行程腳本 jpsall

vim jpsall

#!/bin/bash

for i in hadoop102 hadoop103 hadoop104
do
        echo =============== $i ===============
        ssh $i "$*" "/usr/local/soft/jdk1.8.0_212/bin/jps"
done     

1.3  控制Hadoop啟動和停止腳本

vim myhadoop

#!/bin/bash
if [ $# -lt 1 ]
then
    echo "No Args Input..."
    exit ;
fi
case $1 in
"start")
        echo " =================== 啟動 hadoop集群 ==================="

        echo " --------------- 啟動 hdfs ---------------"
        ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/sbin/start-dfs.sh"
        echo " --------------- 啟動 yarn ---------------"
        ssh hadoop103 "/usr/local/soft/hadoop-3.1.3/sbin/start-yarn.sh"
        echo " --------------- 啟動 historyserver ---------------"
        ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/bin/mapred --daemon start his
toryserver";;
"stop")
        echo " =================== 關閉 hadoop集群 ==================="

        echo " --------------- 關閉 historyserver ---------------"
        ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/bin/mapred --daemon stop hist oryserver"       
        echo " --------------- 關閉 yarn ---------------"
        ssh hadoop103 "/usr/local/soft/hadoop-3.1.3/sbin/stop-yarn.sh"
        echo " --------------- 關閉 hdfs ---------------"
        ssh hadoop102 "/usr/local/soft/hadoop-3.1.3/sbin/stop-dfs.sh"
;;
*)
    echo "Input Args Error..."
;;
esac
        

注意:這里每個腳本都需要修改讀寫權限：chmod 777  腳本名稱

2. 將Hadoop3.1.3用xftp匯入Hadoop102中

3. 解壓Hadoop檔案

tar -zxvf  /usr/local/module/hadoop-3.1.3.tar.gz   -C /usr/local/soft

4. 配置環境變數

export JAVA_HOME=/usr/local/soft/jdk1.8.0_212
export PATH=$PATH:$JAVA_HOME/bin
export HADOOP_HOME=/usr/local/soft/hadoop-3.1.3
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
export REDIS_HOME=/usr/local/soft/redis/
export PATH=$PATH:$REDIS_HOME/bin

5. 集群配置搭建

1) 集群部署規劃

? 備注：NameNode和SecondaryNameNode不要安裝在同一臺服務器

? 備注：ResourceManager也很消耗記憶體，不要和NameNode、SecondaryNameNode配置在同一臺機器上，

2）配置集群

cd  /usr/local/soft/hadoop-3.1.3/etc/hadoop

(a) 核心組態檔 core.site.xml

<configuration>
  <!-- 指定NameNode的地址 -->
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://hadoop102:8020</value>
    </property>

    <!-- 指定hadoop資料的存盤目錄 -->
    <property>
        <name>hadoop.tmp.dir</name>
        <value>/usr/local/soft/hadoop-3.1.3/data</value>
    </property>
</configuration>

(b)HDFS檔案 hdfs-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href=https://www.cnblogs.com/lmandcc/archive/2021/09/17/"configuration.xsl"?>
<configuration>
        <!-- nn web端訪問地址-->
        <property>
        <name>dfs.namenode.http-address</name>
        <value>hadoop102:9870</value>
    </property>
        <!-- 2nn web端訪問地址-->
    <property>
        <name>dfs.namenode.secondary.http-address</name>
        <value>hadoop104:9868</value>
    </property>
<property>
        <name>dfs.permissions.enabled</name>
        <value>false</value>
</property>
<property>
<name>
dfs.client.block.write.replace-datanode-on-failure.enable
</name>
<value>true</value>
</property>
<property>
<name>
dfs.client.block.write.replace-datanode-on-failure.policy
</name>
<value>never</value>
</property>
<property>
    <name>dfs.webhdfs.enabled</name>
    <value>true</value>
</property>
</configuration>

（c）YARN組態檔 yarn-site.xml

<configuration>
<!-- Site specific YARN configuration properties -->
 <!-- 指定MR走shuffle -->
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>

    <!-- 指定ResourceManager的地址-->
    <property>
        <name>yarn.resourcemanager.hostname</name>
        <value>hadoop103</value>
    </property>

    <!-- 環境變數的繼承 -->
    <property>
        <name>yarn.nodemanager.env-whitelist</name>
        <value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLAS
SPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>    </property>
<!-- 開啟日志聚集功能 -->
<property>
    <name>yarn.log-aggregation-enable</name>
    <value>true</value>
</property>
<!-- 設定日志聚集服務器地址 -->
<property>
    <name>yarn.log.server.url</name>
    <value>http://hadoop102:19888/jobhistory/logs</value>
</property>
<!-- 設定日志保留時間為7天 -->
<property>
    <name>yarn.log-aggregation.retain-seconds</name>
    <value>604800</value>
</property>
</configuration>

（d）MapReduce組態檔  mapred-site.xml

在這里需要重命名mapred-site.xml.template 

命令：mv mapred-site.xml.template mapred-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href=https://www.cnblogs.com/lmandcc/archive/2021/09/17/"configuration.xsl"?>

<configuration>
        <!-- 指定MapReduce程式運行在Yarn上 -->
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
<!-- 歷史服務器端地址 -->
<property>
    <name>mapreduce.jobhistory.address</name>
    <value>hadoop102:10020</value>
</property>

<!-- 歷史服務器web端地址 -->
<property>
    <name>mapreduce.jobhistory.webapp.address</name>
    <value>hadoop102:19888</value>
</property>
</configuration>

(e)配置workers

（f）在/hadoop/sbin路徑下：將start-dfs.sh，stop-dfs.sh兩個檔案頂部添加以下引數

HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root

（g）start-yarn.sh，stop-yarn.sh頂部也需添加以下

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root

6.分發Hadoop給剩余節點

xsync /usr/local/soft/hadoop-3.1.3

7. 啟動集群

如果集群是第一次啟動，需要在hadoop102節點格式化NameNode

使用myhadoop start 啟動集群

 使用jpsall查看Java行程

如果組態檔不出錯的話，應該和我Java行程相同

8.停止Hadoop集群

myhadoop stop

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