hadoop 3.2.1 hdfs高可用集羣搭建

hdfs集羣搭建，參照這篇文章：hadoop3.2.1集羣搭建

搭建zookeeper集羣，參照這篇文章：zookeeper集羣搭建

在此基礎上，配置hdfs文件系統nameservice的高可用

創建journalnode進程所在的目錄

mkdir /home/software/hadoop-3.2.1/data/journalnode

dfs.xml配置

    <property>
        <name>dfs.nameservices</name>
        <value>mycluster</value>
    </property>
    <property>
        <name>dfs.ha.namenodes.mycluster</name>
        <value>nn1,nn2, nn3</value>
    </property>
    <property>
        <name>dfs.namenode.rpc-address.mycluster.nn1</name>
        <value>host01:8020</value>
    </property>
    <property>
        <name>dfs.namenode.rpc-address.mycluster.nn2</name>
        <value>host02:8020</value>
    </property>
    <property>
        <name>dfs.namenode.rpc-address.mycluster.nn3</name>
        <value>host03:8020</value>
    </property>
    <property>
        <name>dfs.namenode.http-address.mycluster.nn1</name>
        <value>host01:9870</value>
    </property>
    <property>
        <name>dfs.namenode.http-address.mycluster.nn2</name>
        <value>host02:9870</value>
    </property>
    <property>
        <name>dfs.namenode.http-address.mycluster.nn3</name>
        <value>host03:9870</value>
    </property>
    <property>
        <name>dfs.namenode.shared.edits.dir</name>
        <value>qjournal://host01:8485;host02:8485;host03:8485/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>/home/software/hadoop-3.2.1/data/journalnode</value>
    </property>
    <property>
        <name>dfs.ha.automatic-failover.enabled</name>
        <value>true</value>
    </property>
    <property>
        <name>ha.zookeeper.quorum</name>
        <value>host01:2181,host02:2181,host03:2181</value>
    </property>

在sbin/start-dfs.sh sbin/stop-dfs.sh文件中，前面加上以下內容

HDFS_DATANODE_USER=root
HDFS_DATANODE_SECURE_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
HDFS_JOURNALNODE_USER=root
HDFS_ZKFC_USER=root

啓動hadoop hdfs集羣 

sbin/start-dfs.sh