hdfs-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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<configuration>

<property>
<name>dfs.nameservices</name>
<value>ns</value>
<description>指定hdfs的nameservice为ns，需要和core-site.xml中的保持一致</description>
</property>
<property>
<name>dfs.ha.namenodes.ns</name>
<value>nn1,nn2</value>
<description>ns命名空间下有两个NameNode，逻辑代号，随便起名字，分别是nn1，nn2</description>
</property>
<property>
<name>dfs.namenode.rpc-address.ns.nn1</name>
<value>node01:9000</value>
<description>nn1的RPC通信地址</description>
</property>
<property>
<name>dfs.namenode.http-address.ns.nn1</name>
<value>node01:50070</value>
<description>nn1的http通信地址</description>
</property>
<property>
<name>dfs.namenode.rpc-address.ns.nn2</name>
<value>node02:9000</value>
<description>nn2的RPC通信地址</description>
</property>
<property>
<name>dfs.namenode.http-address.ns.nn2</name>
<value>node02:50070</value>
<description>nn2的http通信地址</description>
</property>

<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>qjournal://node03:8485;node04:8485;node05:8485/ns</value>
<description>指定NameNode的edits元数据在JournalNode上的存放位置</description>
</property>
<property>
<name>dfs.journalnode.edits.dir</name>
<value>/usr/local/hadoop/journaldata</value>
<description>指定JournalNode在本地磁盘存放数据的位置</description>
</property>

<property>
<name>dfs.ha.automatic-failover.enabled</name>
<value>true</value>
<description>开启NameNode失败自动切换</description>
</property>
<property>
<name>dfs.client.failover.proxy.provider.ns</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
<description>配置失败自动切换实现方式,使用内置的zkfc</description>
</property>
<property>
<name>dfs.ha.fencing.methods</name>
<value>
sshfence
shell(/bin/true)
</value>
<description>配置隔离机制，多个机制用换行分割，先执行sshfence，执行失败后执行shell(/bin/true)，/bin/true会直接返回0表示成功</description>
</property>
<property>
<name>dfs.ha.fencing.ssh.private-key-files</name>
<value>/home/hadoop/.ssh/id_rsa</value>
<description>使用sshfence隔离机制时需要ssh免登陆</description>
</property>
<property>
<name>dfs.ha.fencing.ssh.connect-timeout</name>
<value>30000</value>
<description>配置sshfence隔离机制超时时间</description>
</property>

<property>
<name>dfs.replication</name>
<value>3</value>
<description>设置block副本数为3</description>
</property>

<property>
<name>dfs.block.size</name>
<value>134217728</value>
<description>设置block大小是128M</description>
</property>
</configuration>