在CentOS上配置HDFS(Hadoop Distributed File System)的高可用性(HA)方案,通常涉及以下几个关键步骤:
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://mycluster</value>
</property>
<property>
<name>ha.zookeeper.quorum</name>
<value>zk1:2181,zk2:2181,zk3:2181</value>
</property>
<property>
<name>ha.zookeeper.property.dataDir</name>
<value>/var/lib/zookeeper</value>
</property>
</configuration>
<configuration>
<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>/home/hadoop/.ssh/id_rsa</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>/var/lib/hadoop-hdfs/journalnode</value>
</property>
</configuration>
<configuration>
<property>
<name>yarn.resourcemanager.ha.enabled</name>
<value>true</value>
</property>
<property>
<name>yarn.resourcemanager.cluster-id</name>
<value>yarn-cluster</value>
</property>
<property>
<name>yarn.resourcemanager.ha.rm-ids</name>
<value>rm1,rm2</value>
</property>
<property>
<name>yarn.resourcemanager.hostname.rm1</name>
<value>resourcemanager1</value>
</property>
<property>
<name>yarn.resourcemanager.hostname.rm2</name>
<value>resourcemanager2</value>
</property>
<property>
<name>yarn.resourcemanager.zk-address</name>
<value>zk1:2181,zk2:2181,zk3:2181</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address.rm1</name>
<value>resourcemanager1:8032</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address.rm2</name>
<value>resourcemanager2:8032</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address.rm1</name>
<value>resourcemanager1:8088</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address.rm2</name>
<value>resourcemanager2:8088</value>
</property>
</configuration>
在所有JournalNode节点上启动JournalNode服务:
$HADOOP_HOME/sbin/hadoop-daemon.sh start journalnode
在其中一个NameNode节点上格式化NameNode:
$HADOOP_HOME/bin/hdfs namenode -format
在其中一个NameNode节点上启动NameNode并同步元数据到JournalNode:
$HADOOP_HOME/sbin/hadoop-daemon.sh start namenode
然后在另一个NameNode节点上启动NameNode并同步元数据:
$HADOOP_HOME/sbin/hadoop-daemon.sh start namenode
在其中一个ResourceManager节点上启动ResourceManager并同步状态到ZooKeeper:
$HADOOP_HOME/sbin/yarn-daemon.sh start resourcemanager
然后在另一个ResourceManager节点上启动ResourceManager并同步状态:
$HADOOP_HOME/sbin/yarn-daemon.sh start resourcemanager
使用hdfs haadmin
命令验证HA配置是否正确:
$HADOOP_HOME/bin/hdfs haadmin -getServiceState nn1
$HADOOP_HOME/bin/hdfs haadmin -getServiceState nn2
确保客户端配置文件(如core-site.xml
和hdfs-site.xml
)包含正确的HA配置,以便客户端可以自动故障转移。
通过以上步骤,你可以在CentOS上配置HDFS的高可用性方案。请根据实际环境调整配置文件中的参数。