在CentOS上实现HDFS(Hadoop Distributed File System)的高可用性,通常涉及以下几个关键步骤和组件:
core-site.xml
,设置fs.defaultFS
为hdfs://mycluster
。hdfs-site.xml
,添加以下配置:<property>
<name>dfs.nameservices</name>
<value>mycluster</value>
</property>
<property>
<name>dfs.ha.namenodes.mycluster</name>
<value>nn1,nn2</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.nn1</name>
<value>namenode1:8020</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.nn2</name>
<value>namenode2:8020</value>
</property>
<property>
<name>dfs.namenode.http-address.mycluster.nn1</name>
<value>namenode1:50070</value>
</property>
<property>
<name>dfs.namenode.http-address.mycluster.nn2</name>
<value>namenode2:50070</value>
</property>
<property>
<name>dfs.client.failover.proxy.provider.mycluster</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>
<property>
<name>dfs.ha.fencing.methods</name>
<value>sshfence</value>
</property>
<property>
<name>dfs.ha.fencing.ssh.private-key-files</name>
<value>/path/to/private/key</value>
</property>
<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>qjournal://journalnode1:8485;journalnode2:8485;journalnode3:8485/mycluster</value>
</property>
<property>
<name>dfs.journalnode.edits.dir</name>
<value>/path/to/journalnode/data</value>
</property>
mkdir -p /path/to/journalnode/data
hdfs --daemon start journalnode
hdfs namenode -format
hdfs --daemon start namenode
hdfs namenode -bootstrapStandby
hdfs zkfc -formatZK
systemctl enable hadoop-zkfc
systemctl start hadoop-zkfc
core-site.xml
和hdfs-site.xml
)正确,并且客户端能够解析集群名称服务。systemctl stop hadoop-namenode
访问HDFS Web界面(通常是http://namenode1:50070
或http://namenode2:50070
),确认集群状态是否正常。通过以上步骤,你可以在CentOS上配置一个高可用的HDFS集群。请根据你的具体环境和需求调整配置。