黑猴子的家：自动故障转移HDFS-HA

1、规划集群

hadoop102	hadoop103	hadoop104
NameNode	NameNode	""
JournalNode	JournalNode	JournalNode
DataNode	DataNode	DataNode
ZK	ZK	ZK

2、关闭所有HDFS服务

[yinggu@hadoop102 hadoop-2.7.2]$ sbin/stop-dfs.sh

3、增加配置参数

core-site.xml

    ha.zookeeper.quorum
    hadoop102:2181,hadoop103:2181,hadoop104:2181

hdfs-site.xml

    dfs.ha.automatic-failover.enabled
    true

分发hadoop

[yinggu@hadoop102 HA]$ scp -r hadoop-2.7.2/  yinggu@hadoop103:/opt/module/HA/
[yinggu@hadoop102 HA]$ scp -r hadoop-2.7.2/  yinggu@hadoop104:/opt/module/HA/

4、zookeeper

(1)分别启动hadoop[102-104] 节点上的zookeeper

[yinggu@hadoop102 zookeeper-3.4.10]$ bin/zkServer.sh start
[yinggu@hadoop103 zookeeper-3.4.10]$ bin/zkServer.sh start
[yinggu@hadoop104 zookeeper-3.4.10]$ bin/zkServer.sh start

(2)分别查看zookeeper的运行状态

hadoop102

[yinggu@hadoop102 zookeeper-3.4.10]$ bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower

hadoop103

[yinggu@hadoop103 zookeeper-3.4.10]$ bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: leader

hadoop104

[yinggu@hadoop104 zookeeper-3.4.10]$ bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower

5、初始化zookeeper中的HA状态

[yinggu@hadoop102 hadoop-2.7.2]$ bin/hdfs zkfc -formatZK
尖叫提示：只需要在第一次部署时初始化

6、启动HDFS

方式一

[yinggu@hadoop102 hadoop-2.7.2]$ sbin/start-dfs.sh
注意：如果没有使用start-dfs.sh命令启动服务，每个服务需要单独启动

方式二

[yinggu@hadoop102 hadoop-2.7.2]$ sbin/hadoop-daemon.sh start namenode
[yinggu@hadoop103 hadoop-2.7.2]$ sbin/hadoop-daemon.sh start namenode
[yinggu@hadoop102 hadoop-2.7.2]$ sbin/hadoop-daemons.sh start datanode
[yinggu@hadoop103 hadoop-2.7.2]$ sbin/hadoop-daemons.sh start datanode
[yinggu@hadoop104 hadoop-2.7.2]$ sbin/hadoop-daemons.sh start datanode
[yinggu@hadoop102 hadoop-2.7.2]$ sbin/hadoop-daemon.sh start journalnode
[yinggu@hadoop103 hadoop-2.7.2]$ sbin/hadoop-daemon.sh start journalnode
[yinggu@hadoop104 hadoop-2.7.2]$ sbin/hadoop-daemon.sh start journalnode
[yinggu@hadoop102 hadoop-2.7.2]$ sbin/hadoop-daemin.sh start zkfc
[yinggu@hadoop103 hadoop-2.7.2]$ sbin/hadoop-daemin.sh start zkfc

7、测试

[yinggu@hadoop102 hadoop-2.7.2]$ sbin/hadoop-daemon.sh stop namenode