查看“Hadoop install”的源代码

=== ENV ===

==== USER ====
 groupadd hadoop -g 1001
 useradd hdfs -g hadoop -u 1001

==== Java ====
 ln -s /usr/java/jdk1.8.0_361/jre/bin/java /usr/bin/java

<nowiki>#</nowiki> Java Error

java 以前使用 --version 来查看版本的；java8 以后变更为 -version。

 $ java --version
 Unrecognized option: --version
 Error: Could not create the Java Virtual Machine.
 Error: A fatal exception has occurred. Program will exit.

 $  java -version
 java version "1.8.0_361"
 Java(TM) SE Runtime Environment (build 1.8.0_361-b09)
 Java HotSpot(TM) 64-Bit Server VM (build 25.361-b09, mixed mode)

====hadoop====
 ln -s /opt/hadoop-3.3.0 /opt/hadoop

====profile====
 <nowiki>#</nowiki> Java, 20201010, Adam
 export JAVA_HOME=/usr/java/jdk1.8.0_361
 export PATH=$PATH:$JAVA_HOME/bin
 <nowiki>#</nowiki> hadoop, 20201010, Adam
 export HADOOP_HOME=/opt/hadoop
 export PATH=$PATH:$HADOOP_HOME/bin 
 export PATH=$PATH:$HADOOP_HOME/sbin
 export HADOOP_CONF_DIR=${HADOOP_HOME}/etc/hadoop

===Hadoop 配置 ===

====配置 Hadoop 环境脚本文件中的 JAVA_HOME 参数====
<nowiki>#</nowiki> hadoop是守护线程 读取不到 /etc/profile 里面配置的JAVA_HOME路径

 <nowiki>#</nowiki> /opt/hadoop/etc/hadoop/
 <nowiki>#</nowiki> hadoop-env.sh, mapred-env.sh, yarn-env.sh
 cp hadoop-env.sh hadoop-env.sh.20210409
 cp mapred-env.sh mapred-env.sh.20210409
 cp yarn-env.sh   yarn-env.sh.20210409
 
 echo '
 <nowiki>#</nowiki> hdfs, 20210409, Adam
 export JAVA_HOME=/usr/java/jdk1.8.0_361' >> 

====Setup====
=====core-site.xml (Common组件)=====
 <configuration>
   <property>
     <!-- 配置hdfs地址 -->
     <name>fs.defaultFS</name>
     <value>hdfs://'''g2-hdfs-01:9000'''</value>
   </property>
   <property>
     <name>io.file.buffer.size</name>
     <value>131072</value>
   </property>
   <property>
         <!-- 保存临时文件目录 -->
     <name>hadoop.tmp.dir</name>
     <value>/u01/hdfs/tmp</value>
   </property>
 </configuration>
=====hdfs-site.xml (HDFS组件)===== 

*修改 dfs.replication 不影响历史文件的备份数。修改历史文件备份数：hadoop fs -setrep -R 3 <path>
 <configuration>
   <property>
     <!-- 主节点地址 -->
     <name>dfs.namenode.http-address</name>
     <value>'''g2-hdfs-01:9870'''</value>
   </property>
   <property>
         <!-- 第二节点地址 -->
     <name>dfs.namenode.secondary.http-address</name>
     <value>'''g2-hdfs-02:9870'''</value>
   </property>
   <property>
     <name>dfs.namenode.name.dir</name>
     <value>file:/u01/hdfs/dfs/nn</value>
   </property>
   <property>
     <name>dfs.datanode.data.dir</name>
     <value>file:/u01/hdfs/dfs/dn</value>
   </property>
   <property> 
     <name>dfs.webhdfs.enabled</name> 
     <value>true</value> 
   </property>
   <property>
         <!-- 配置false后，无需权限即可生成dfs上的文件 -->
     <name>dfs.permissions</name>
     <value>false</value>
   </property>
   <property>
             <!-- 在文件中出现的主机会被下线 -->
     <name>dfs.hosts.exclude</name>
     <value>/opt/hadoop/etc/hadoop/workers.exclude</value>
   </property>
 </configuration>
 
 -- del
   <property>
         <!-- 备份数为默认值3 -->
     <name>dfs.replication</name>
     <value>3</value>
   </property>
   <property>
     <name>dfs.blocksize</name>
     <value>268435456</value>
   </property>
   <property>
     <name>dfs.namenode.handler.count</name>
     <value>100</value>
   </property>

=====mapred-site.xml=====
 <configuration>
   <property>
     <name>mapreduce.framework.name</name>
     <value>yarn</value> 
   </property>
 </configuration>
 
 -- del
   <property>
      <name>mapreduce.jobhistory.address</name>
      <value>g2-hdfs-01:10020</value>
   </property>
   <property>
      <name>mapreduce.jobhistory.webapp.address</name>
      <value>g2-hdfs-01:19888</value>
   </property>
   <property>
      <name>mapreduce.application.classpath</name>
      <value>$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*:$HADOOP_MAPRED_HOME/share/ hadoop/mapreduce/lib/*</value>
   </property>
=====yarn-site.xml=====
 <configuration>
   <property>
     <name>yarn.resourcemanager.hostname</name>
     <value>'''g2-hdfs-01'''</value>
   </property>
   <property>
     <name>yarn.nodemanager.aux-services</name>  
     <value>mapreduce_shuffle</value>
   </property>
   <property>
     <name>yarn.resourcemanager.webapp.address</name>
     <value>'''g2-hdfs-01:8088'''</value>
   </property>
   <property>
     <name>yarn.scheduler.maximum-allocation-mb</name>
     <value>32768</value>
   </property>
   <property>
     <name>yarn.nodemanager.vmem-check-enabled</name>
     <value>false</value>
   </property>
   <property>
     <name>yarn.nodemanager.env-whitelist</name>
     <value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPE ND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>
   </property>
 </configuration>

   <property>
     <name>yarn.resourcemanager.webapp.address</name>
     <value>hadoop01/192.168.44.5:8088</value>
     <description>配置外网只需要替换外网ip为真实ip，否则默认为 localhost:8088</description>
   </property>
 
 yarn.resourcemanager.hostname
 指定yarn的ResourceManager管理界面的地址，不配的话，Active Node始终为0
 yarn.scheduler.maximum-allocation-mb
 每个节点可用内存,单位MB,默认8182MB
 yarn.nodemanager.aux-services
 reducer获取数据的方式
 yarn.nodemanager.vmem-check-enabled
 false = 忽略虚拟内存的检查

=====workers=====
 g2-hdfs-01
 g2-hdfs-02
 ..

==== Node ====

===== Status =====
 hdfs dfsadmin -report
 yarn node -list

===== Add =====
新增节点上启动 dfs & yarn 服务后，namenode 节点：

* 可看到新增节点
* workers 需增加新增节点主机名称，否则下次 start-dfs.sh 会漏掉该节点

=====Exclude=====
若在 hdfs-site.xml 中配置了 dfs.hosts.exclude，则可以动态下线主机。
 hdfs dfsadmin -refreshNodes
注意：hdfs-site.xml 内容修改，需重启 dfs 生效。但配置了 dfs.hosts.exclude，修改相应文件后 refresh node 即可生效。

===INIT===
 <nowiki>#</nowiki> Path
 mkdir -p /u01/hdfs/dfs/nn
 mkdir -p /u01/hdfs/dfs/dn
 mkdir -p /u01/hdfs/tmp
 
 # chown
 chown -R hdfs:hadoop /opt/hadoop*
 chown -R hdfs:hadoop /u01/hdfs
 
 # format nn
 /opt/hadoop/bin/hdfs namenode -format

===Start===
 ## Start : hdfs(发现需要用 hdfs 停服务，root不可停）
 /opt/hadoop/sbin/start-dfs.sh
 /opt/hadoop/sbin/start-yarn.sh
 
 /opt/hadoop/sbin/stop-dfs.sh
 /opt/hadoop/sbin/stop-yarn.sh
 
 http://mc0:9870   # hdfs
 http://mc0:8088   # yarn
 
 ## 单节点启停
 # /opt/hadoop/bin
 hdfs --daemon start datanode
 hdfs --daemon start namenode
 
 yarn --daemon start resourcemanager 
 yarn --daemon start nodemanager

===SYNC ===
 # HN=$1
 HN=g2-hdfs-02
 
 # hosts
 ssh ${HN} "hostnamectl set-hostname ${HN}"
 scp /etc/hosts ${HN}:/etc/hosts
 
 # Java
 scp /u01/soft/jdk_180361.tar.gz ${HN}:/tmp/
 ssh ${HN} "cd /tmp;tar -xzvf jdk_180361.tar.gz;mkdir /usr/java/;mv jdk1.8.0_361 /usr/java/;"
 ssh ${HN} "ln -s /usr/java/jdk1.8.0_361/jre/bin/java /usr/bin/java"
 
 # Hadoop
 ssh ${HN} "groupadd hadoop -g 1001;useradd hdfs -m -s /bin/bash -g hadoop -u 1001"
 
 scp /home/hdfs/.ssh/authorized_keys ${HN}:/tmp/
 ssh ${HN} "mkdir /home/hdfs/.ssh;mv /tmp/authorized_keys /home/hdfs/.ssh/;chown -R hdfs:hadoop /home/hdfs/.ssh"
 
 scp /u01/soft/hadoop_334.tar.gz ${HN}:/tmp/
 ssh ${HN} "cd /tmp;tar -xzvf hadoop_334.tar.gz;mv hadoop-3.3.4 /opt/;ln -s /opt/hadoop-3.3.4 /opt/hadoop;chown -R hdfs:hadoop /opt/hadoop*"
 
 ssh ${HN} "mkdir -p /u01/hdfs/dfs/nn /u01/hdfs/dfs/dn /u01/hdfs/tmp;chown -R hdfs:hadoop /u01/hdfs"
 ssh hdfs@${HN} "/opt/hadoop/bin/hdfs namenode -format"

===Error=== 
*ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.java.lang.IllegalArgumentException: Does not contain a valid host:port authority: esxi_mc0:9000
 主机名称不合法，不允许包含‘.’ ‘/’ '_'等非法字符

*WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Unable to get NameNode addresses
 检查 core-site.xml 中 fs.defaultFS 配置

* Hadoop 退出安全模式
 hdfs dfsadmin -safemode leave


[[分类:Develop]]
[[分类:Hadoop]]