HA配置之hdfs-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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<!-- Put site-specific property overrides in this file. -->

<configuration>

<!-- NameNode数据存储目录 -->
<property>
<name>dfs.namenode.name.dir</name>
<value>file://${hadoop.tmp.dir}/name</value>
</property>

<!-- DataNode数据存储目录 -->
<property>
<name>dfs.datanode.data.dir</name>
<value>file://${hadoop.tmp.dir}/data</value>
</property>

<!-- JournalNode数据存储目录 -->
<property>
<name>dfs.journalnode.edits.dir</name>
<value>${hadoop.tmp.dir}/jn</value>
</property>

<!-- 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,nn3</value>
</property>

<!-- NameNode的RPC通信地址 -->
<property>
<name>dfs.namenode.rpc-address.mycluster.nn1</name>
<value>hadoop102:8020</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.nn2</name>
<value>hadoop103:8020</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.nn3</name>
<value>hadoop104:8020</value>
</property>

<!-- NameNode的http通信地址 -->
<property>
<name>dfs.namenode.http-address.mycluster.nn1</name>
<value>hadoop102:9870</value>
</property>
<property>
<name>dfs.namenode.http-address.mycluster.nn2</name>
<value>hadoop103:9870</value>
</property>
<property>
<name>dfs.namenode.http-address.mycluster.nn3</name>
<value>hadoop104:9870</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;hadoop105:8485;hadoop106:8485/mycluster</value>
</property>

<!-- 访问代理类：client用于确定哪个NameNode为Active -->
<property>
<name>dfs.client.failover.proxy.provider.mycluster</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</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秘钥登录-->
<property>
<name>dfs.ha.fencing.ssh.private-key-files</name>
<value>/home/rainys/.ssh/id_rsa</value>
</property>

<!-- 启用nn故障自动转移 -->
<property>
<name>dfs.ha.automatic-failover.enabled</name>
<value>true</value>
</property>
</configuration>