Hadoop基于Quorum Journal Manager的高可用配置

 基于前一篇：Hadoop安装与配置进行修改 http://liumangafei.iteye.com/blog/2303359

 修改：core-site.xml

<configuration>
        <property>
                <name>fs.defaultFS</name>
                <value>hdfs://mycluster</value>
        </property>
        <property>
                <name>hadoop.tmp.dir</name>
                <value>/usr/hadoop/tmp/hadoop-2.6.4</value>
        </property>
        <property>
                <name>io.file.buffer.size</name>
                <value>131072</value>
        </property>
</configuration>

 修改：hdfs-site.xml

<configuration>
        <property>
                <name>dfs.namenode.name.dir</name>
                <value>file:///usr/hadoop/tmp/hadoop-2.6.4/dfs/name</value>
        </property>
        <property>
                <name>dfs.datanode.data.dir</name>
                <value>file:///usr/hadoop/tmp/hadoop-2.6.4/dfs/data</value>
        </property>
        <property>
                <name>dfs.replication</name>
                <value>3</value>
        </property>
        <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>hadoop1:8020</value>
        </property>
	<property>
                <name>dfs.namenode.rpc-address.mycluster.nn2</name>
                <value>hadoop2:8020</value>
        </property>
	<property>
                <name>dfs.namenode.http-address.mycluster.nn1</name>
                <value>hadoop1:50070</value>
        </property>
	<property>
                <name>dfs.namenode.http-address.mycluster.nn2</name>
                <value>hadoop2:50070</value>
        </property>
	<property>
                <name>dfs.namenode.shared.edits.dir</name>
                <value>qjournal://hadoop2:8485;hadoop3:8485;hadoop4:8485;hadoop5:8485;hadoop6:8485/mycluster</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>/root/.ssh/id_rsa</value>
        </property>
	<property>
                <name>dfs.journalnode.edits.dir</name>
                <value>/usr/hadoop/journalnode</value>
        </property>
        <property>
                <name>dfs.ha.automatic-failover.enabled</name>
                <value>true</value>
        </property>
	<property>
                <name>ha.zookeeper.quorum</name>
                <value>hadoop2:2181,hadoop3:2181,hadoop4:2181</value>
        </property>
	<property>
                <name>dfs.webhdfs.enabled</name>
                <value>true</value>
        </property>
        <property>
                <name>dfs.permissions.enabled</name>
                <value>false</value>
        </property>
</configuration>

  创建对应的journalnode文件夹

  配置：

    1、删除hadoop对应的logs、name、data、journalnode对应的内容

    2、执行：bin/hdfs zkfc -formatZK          // 格式化zkfc

    3、所有journalnode执行：sbin/hadoop-daemon.sh start journalnode        // 启动所有journalnode节点

    4、执行：bin/hdfs namenode -format        // 格式化当前的namenode

    5、拷贝dfs/name下的内容拷贝到另一个namenode下        // 拷贝namenode信息到另一个namenode

    6、执行：sbin/start-all.sh        // 启动hadoop