[hadoop 配置文件] hdfs-site.xml 有关知识点

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>2</value>
    </property>
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>file:/usr/hadoop/hadoop-3.1.2/hdfs/name</value>
        <final>true</final>
    </property>
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>file:/usr/hadoop/hadoop-3.1.2/hdfs/data</value>
        <final>true</final>
    </property>
    <property>
        <name>dfs.namenode.secondary.http-address</name>
        <value>master:50090</value>
    </property>
    <property>
        <name>dfs.http.address</name>
        <value>master:50070</value>
    </property>
    <property>
        <name>dfs.webhdfs.enabled</name>
        <value>true</value>
    </property>
    </configuration>

• dfs.replication
• 设置副本数

    <property>
        <name>dfs.replication</name>
        <value>2</value>
    </property>

• dfs.namenode.name.dir
• 设置存放NameNode的文件路径

  	<property>
        <name>dfs.namenode.name.dir</name>
        <value>file:/usr/hadoop/hadoop-3.1.2/hdfs/name</value>
        <final>true</final>
    </property>

• dfs.datanode.data.dir
• 设置存放DataNode的文件路径

	<property>
        <name>dfs.datanode.data.dir</name>
        <value>file:/usr/hadoop/hadoop-3.1.2/hdfs/data</value>
        <final>true</final>
    </property>

• dfs.permissions
• 权限还是不要的好

	<property>
    	<name>dfs.permissions</name>
    	<value>false</value>
	</property>

• dfs.secondary.http.address
• SNN路径

    <property>
        <name>dfs.namenode.secondary.http-address</name>
        <value>master:50090</value>
    </property>