在Ubuntu上安装 Hadoop 3

前提条件：

• Python 推荐3.8
• JDK 推荐1.8

解压安装

sudo tar -zxvf  hadoop-3.3.0.tar.gz -C /usr/local
cd /usr/local
sudo mv  hadoop-3.3.0    hadoop   
sudo chown -R hadoop ./hadoop 

配置环境变量

vim ~/.bashrc 

# hadoop
export HADOOP_HOME=/usr/local/hadoop
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
export HADOOP_CLASS_PATH=$HADOOP_CONF_DIR
export PATH=$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$PATH

source ~/.bashrc

安装检测

cd /usr/local/hadoop/bin
./hadoop version

伪分布式配置

修改配置文件，文件位于hadoop包的/etc/hadoop下

编辑 hadoop-env.sh

输入echo $JAVA_HOME 查询JDK

cd /usr/local/hadoop/etc/hadoop
sudo vim hadoop-env.sh
export JAVA_HOME=/usr/local/jdk

编辑 core-site.xml

sudo vim core-site.xml

<configuration>
    <property>
        <name>hadoop.tmp.dir</name>
        <value>file:/usr/local/hadoop/tmp</value>
        <description>Abase for other temporary directories.</description>
    </property>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
</configuration>

编辑 hdfs-site.xml

sudo vim hdfs-site.xml

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>file:/usr/local/hadoop/tmp/dfs/name</value>
    </property>
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>file:/usr/local/hadoop/tmp/dfs/data</value>
    </property>
</configuration>

执行 NameNode 的格式化

./bin/hdfs namenode -format

启动namenode和datanode进程

cd /usr/local/hadoop
./sbin/start-dfs.sh 
./sbin/stop-dfs.sh

查看启动结果

jps

报错hadoop: hadoop@hadoop: Permission denied (publickey,password).

ssh-keygen -t rsa
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
chmod 700 ~/.ssh

hadoop3的webUI已经改到端口 localhost:9870上面，而不是原来的50070

配置yarn（非必须）

cd /usr/local/hadoop/

cp etc/hadoop/mapred-site.xml.template etc/hadoop/mapred-site.xml

修改etc/hadoop/mapred-site.xml

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

修改etc/hadoop/yarn-site.xml

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

启动资源管理器

./sbin/start-yarn.sh
./sbin/mr-jobhistory-daemon.sh start historyserver

问题输入./sbin/start-yarn.sh会显示权限不够 则输入 sudo chmod 777 sbin进行赋权限

分布式集群部署待续

修改hadoop-3.3.0/etc/hadoop 目录下文件

• core-site.xml
• hadoop-env.sh
• hdfs-site.xml
• mapred-site.xml
• yarn-site.xml
• workers