Hadoop cluster startup configuration

Three machines
master hadoop01
from hadoop02
from hadoop03

1. Hadoop decompression package

• 修改core-site.xml
  cd hadoop-2.7.4/etc/hadoop/
  vim core-site.xml

<configuration>
          <!-- 指定NameNode的地址 -->
          <property>
                  <name>fs.defaultFS</name>
                <value>hdfs://hadoop01:9000</value>
          </property>
          <!-- 指定hadoop数据的存储目录 -->
          <property>
                  <name>hadoop.tmp.dir</name>
                <value>/root/export/servers/hadoop-2.7.4/tmp</value>
          </property>
</configuration>

• Modify hdfs-site.xml
  vim hdfs-site.xml

<configuration>
	<!-- 指定副本数量 -->
	<property> 
          <name>dfs.replication</name>
          <value>3</value>
     </property>
	<!-- web端访问地址 -->
    <property>
           <name>dfs.namenode.secondary.http-address</name>
           <value>hadoop02:50090</value>
     </property>
</configuration>

• 修改mapred-site.xml
  cp mapred-site.xml.template mapred-site.xml
  vim mapred-site.xml

<configuration>
        <!-- 指定MapReduce程序运行在Yarn上 -->
          <property>
                <name>mapreduce.framework.name</name>
                <value>yarn</value>
          </property>
</configuration>

• 修改yarn-site.xml
  cp mapred-site.xml.template mapred-site.xml
  vim mapred-site.xml

<configuration>
        <!-- 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>hadoop01</value>
          </property>
</configuration>

Precautions

• add hostname

vim slaves
hadoop01
hadoop02
hadoop03

• Formatting is required before starting the cluster for the first time

 hdfs namenode -format

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