hdfs

ref

https://www.cnblogs.com/bigdatasafe/p/10784523.html

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License. See accompanying LICENSE file.
-->

<!-- Put site-specific property overrides in this file. -->

<configuration>

  <property>
    <name>dfs.nameservices</name>
    <value>mycluster</value>
  </property>

  <!-- mycluster下面有两个NameNode，分别是nn1，nn2 -->
  <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>hadoop1:9000</value>
  </property>
  <!-- nn1的http通信地址 -->
  <property>
    <name>dfs.namenode.http-address.mycluster.nn1</name>
    <value>hadoop1:50070</value>
  </property>

  <!-- nn2的RPC通信地址 -->
  <property>
    <name>dfs.namenode.rpc-address.mycluster.nn2</name>
    <value>hadoop2:9000</value>
  </property>
  <!-- nn2的http通信地址 -->
  <property>
    <name>dfs.namenode.http-address.mycluster.nn2</name>
    <value>hadoop2:50070</value>
  </property>

  <!-- 指定NameNode的edits元数据在JournalNode上的存放位置 -->
  <property>
    <name>dfs.namenode.shared.edits.dir</name>
    <value>qjournal://hadoop1:8485;hadoop2:8485;hadoop3:8485/mycluster</value>
  </property>

  <!-- 指定JournalNode在本地磁盘存放数据的位置 -->
  <property>
    <name>dfs.journalnode.edits.dir</name>
    <value>/data/journaldata</value>
  </property>

  <!-- 开启NameNode失败自动切换 -->
  <property>
    <name>dfs.ha.automatic-failover.enabled</name>
    <value>true</value>
  </property>

  <!-- 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>

  <!-- 配置隔离机制方法，多个机制用换行分割，即每个机制暂用一行-->
  <!-- 其中shell(/myclustern/true) 表示可执行一个脚本  比如 shell(/app/yunwei/hadoop_fence.sh) -->
  <property>
    <name>dfs.ha.fencing.methods</name>
    <value>
      sshfence
      shell(/myclustern/true)
    </value>
  </property>

  <!-- 使用sshfence隔离机制时需要ssh免登陆 -->
  <property>
    <name>dfs.ha.fencing.ssh.private-key-files</name>
    <value>/home/hadoop/.ssh/id_rsa</value>
  </property>

  <!-- 配置sshfence隔离机制超时时间 单位：毫秒 -->
  <property>
    <name>dfs.ha.fencing.ssh.connect-timeout</name>
    <value>30000</value>
  </property>



</configuration>

core-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License. See accompanying LICENSE file.
-->

<!-- Put site-specific property overrides in this file. -->

<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://mycluster</value>
<final>true</final>
</property>

  <property>
    <name>hadoop.tmp.dir</name>
    <value>/data/hadoop/tmp</value>
  </property>



 <property>
   <name>ha.zookeeper.quorum</name>
   <value>hadoop1:2181,hadoop2:2181,hadoop3:2181</value>
 </property>


</configuration>

1,start all zk

2,start journalnode on each vm

hadoop start journalnode

3, hadoop format

hdfs namenode -format

4, copy all hadoop tmp/dir  to slaves

 scp -r tmp/ yun@mini02:/app/hadoop 

5, format ZK

hdfs zkfc -formatZK 

6, start-dfs.sh