记录配置集群HA的坑

配置core-site.xml

<configuration>
<!-- 把两个NameNode）的地址组装成一个集群mycluster -->
        <property>
            <name>fs.defaultFS</name>
            <value>hdfs://mycluster</value>
        </property>

        <!-- 指定hadoop运行时产生文件的存储目录 -->
        <property>
            <name>hadoop.tmp.dir</name>
            <value>/opt/module/ha/hadoop-2.7.2/data/tmp</value>
        </property>

<!-- 自动化配置-->

<property>

  <name>ha.zookeeper.quorum</name>

  <value>hadoop102:2181,hadoop103:2181,hadoop104:2181</value>

</property>

</configuration>
    

配置 hdfs-site.xml

<configuration>
    <!-- 完全分布式集群名称 -->
    <property>
        <name>dfs.nameservices</name>
        <value>mycluster</value>
    </property>

    <!-- 集群中NameNode节点都有哪些 -->
    <property>
        <name>dfs.ha.namenodes.mycluster</name>
        <value>nn1,nn2</value>
    </property>

    <!-- nn1的RPC通信地址 -->
    <property>
        <name>dfs.namenode.rpc-address.mycluster.nn1</name>
        <value>hadoop102:9000</value>
    </property>

    <!-- nn2的RPC通信地址 -->
    <property>
        <name>dfs.namenode.rpc-address.mycluster.nn2</name>
        <value>hadoop103:9000</value>
    </property>

    <!-- nn1的http通信地址 -->
    <property>
        <name>dfs.namenode.http-address.mycluster.nn1</name>
        <value>hadoop102:50070</value>
    </property>

    <!-- nn2的http通信地址 -->
    <property>
        <name>dfs.namenode.http-address.mycluster.nn2</name>
        <value>hadoop103:50070</value>
    </property>

    <!-- 指定NameNode元数据在JournalNode上的存放位置 -->
    <property>
        <name>dfs.namenode.shared.edits.dir</name>
    <value>qjournal://hadoop102:8485;hadoop103:8485;hadoop104:8485/mycluster</value>
    </property>

    <!-- 配置隔离机制，即同一时刻只能有一台服务器对外响应 -->
    <property>
        <name>dfs.ha.fencing.methods</name>
        <value>sshfence</value>
    </property>

    <!-- 使用隔离机制时需要ssh无秘钥登录-->
    <property>
        <name>dfs.ha.fencing.ssh.private-key-files</name>
        <value>/home/atguigu/.ssh/id_rsa</value>
    </property>

    <!-- 声明journalnode服务器存储目录-->
    <property>
        <name>dfs.journalnode.edits.dir</name>
        <value>/opt/module/ha/hadoop-2.7.2/data/jn</value>
    </property>

    <!-- 关闭权限检查-->
    <property>
        <name>dfs.permissions.enable</name>
        <value>false</value>
    </property>

    <!-- 访问代理类：client，mycluster，active配置失败自动切换实现方式-->
    <property>
          <name>dfs.client.failover.proxy.provider.mycluster</name>
    <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
    </property>
    <!-- 自动化配置-->
 <property>
    <name>dfs.ha.automatic-failover.enabled</name>
    <value>true</value>
</property>
    
</configuration>

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