环境信息
- 操作系统:macOS Mojave 10.14.6
- JDK:1.8.0_211 (安装位置:/Library/Java/JavaVirtualMachines/jdk1.8.0_211.jdk/Contents/Home)
- hadoop:3.2.1
开通ssh
在"系统偏好设置"->"共享",设置如下:
免密码登录
执行以下命令创建秘钥:
ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
一路next,最终会在~/.ssh目录生成id_rsa和id_rsa.pub文件 2. 执行以下命令,将自己的秘钥放在ssh授权目录,这样ssh登录自身就不需要输入密码了:
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
ssh登录试试,这次不需要密码了:
Last login: Sun Oct 13 21:44:17 on ttys000 (base) zhaoqindeMBP:~ zhaoqin$ ssh localhost Last login: Sun Oct 13 21:48:57 2019 (base) zhaoqindeMBP:~ zhaoqin$
下载hadoop
- 下载hadoop,地址是:http://hadoop.apache.org/releases.html
- 将下载文件hadoop-3.2.1.tar.gz解压,我这里解压后的地址是:~/software/hadoop-3.2.1/
如果只需要hadoop单机模式,现在就可以了,但是单机模式没有hdfs,因此接下来要做伪分布模式的设置;
伪分布模式设置
进入目录hadoop-3.2.1/etc/hadoop,做以下设置:
打开hadoop-env.sh文件,增加JAVA的路径设置:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_211.jdk/Contents/Home
打开core-site.xml文件,将configuration节点改为如下内容:
fs.defaultFS hdfs://localhost:9000 打开hdfs-site.xml文件,将configuration节点改为如下内容:
dfs.replication 1 打开mapred-site.xml文件,将configuration节点改为如下内容:
mapreduce.framework.name yarn 打开yarn-site.xml文件,将configuration节点改为如下内容:
yarn.nodemanager.aux-services mapreduce_shuffle yarn.nodemanager.env-whitelist JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME 在目录hadoop-3.2.1/bin执行以下命令,初始化hdfs:
./hdfs namenode -format
初始化成功后,可见如下信息:
2019-10-13 22:13:32,468 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
2019-10-13 22:13:32,473 INFO namenode.FSImage: FSImageSaver clean checkpoint: txid=0 when meet shutdown.
2019-10-13 22:13:32,474 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at zhaoqindeMBP/192.168.50.12
************************************************************/
启动
进入目录hadoop-3.2.1/sbin,执行./start-dfs.sh启动hdfs:
(base) zhaoqindeMBP:sbin zhaoqin$ ./start-dfs.sh Starting namenodes on [localhost] Starting datanodes Starting secondary namenodes [zhaoqindeMBP] zhaoqindeMBP: Warning: Permanently added 'zhaoqindembp,192.168.50.12' (ECDSA) to the list of known hosts. 2019-10-13 22:28:30,597 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
上面的警告不会影响使用; 2. 浏览器访问地址:localhost:9870 ,可见hadoop的web页面如下图: 3. 进入目录hadoop-3.2.1/sbin,执行./start-yarn.sh启动yarn:
base) zhaoqindeMBP:sbin zhaoqin$ ./start-yarn.sh
Starting resourcemanager
Starting nodemanagers
浏览器访问地址:localhost:8088 ,可见yarn的web页面如下图:
执行jps命令查看所有java进程,正常情况下可以见到以下进程:
(base) zhaoqindeMBP:sbin zhaoqin$ jps 2161 NodeManager 1825 SecondaryNameNode 2065 ResourceManager 1591 NameNode 2234 Jps 1691 DataNode
至此,hadoop3伪分布式环境的部署、设置、启动都已经完成。
停止hadoop服务
进入目录hadoop-3.2.1/sbin,执行./stop-all.sh即可关闭hadoop的所有服务:
(base) zhaoqindeMBP:sbin zhaoqin$ ./stop-all.sh
WARNING: Stopping all Apache Hadoop daemons as zhaoqin in 10 seconds.
WARNING: Use CTRL-C to abort.
Stopping namenodes on [localhost]
Stopping datanodes
Stopping secondary namenodes [zhaoqindeMBP]
2019-10-13 22:49:00,941 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Stopping nodemanagers
Stopping resourcemanager
以上就是Mac环境部署hadoop3的全部过程,希望能给您一些参考。