YARN的HA搭建

选择192.168.230.10(node1),192.168.230.14(node5)两台主机作为ResourceManagerdatanode与nodemanager一定要放在一个机器上

YARN的体系架构

1、配置/opt/modules/hadoop-2.5.1/etc/hadoop/mapred-site.xml:

<configuration>    <property>        <name>mapreduce.framework.name</name>        <value>yarn</value>    </property></configuration>

2、配置/opt/modules/hadoop-2.5.1/etc/hadoop/yarn-site.xml:

<configuration>    <property>        <name>yarn.nodemanager.aux-services</name>        <value>mapreduce_shuffle</value>    </property></configuration>

 <!-- 启用 --> <property>   <name>yarn.resourcemanager.ha.enabled</name>   <value>true</value> </property> <!-- 集群ID号 --> <property>   <name>yarn.resourcemanager.cluster-id</name>   <value>cluster1</value> </property> <property>   <name>yarn.resourcemanager.ha.rm-ids</name>   <value>rm1,rm2</value> </property> <property>   <name>yarn.resourcemanager.hostname.rm1</name>   <value>node1</value> </property> <property>   <name>yarn.resourcemanager.hostname.rm2</name>   <value>node5</value> </property> <property>   <name>yarn.resourcemanager.zk-address</name>   <value>node2:2181,node3:2181,node5:2181</value> </property>

3、将在node1主机上配置好的yarn-site.xml，mapred-site.xml文件

scp /opt/modules/hadoop-2.5.1/etc/hadoop/yarn-site.xml root@node2:/opt/modules/hadoop-2.5.1/etc/hadoop/scp /opt/modules/hadoop-2.5.1/etc/hadoop/mapred-site.xml root@node2:/opt/modules/hadoop-2.5.1/etc/hadoop/scp /opt/modules/hadoop-2.5.1/etc/hadoop/yarn-site.xml root@node3:/opt/modules/hadoop-2.5.1/etc/hadoop/scp /opt/modules/hadoop-2.5.1/etc/hadoop/mapred-site.xml root@node3:/opt/modules/hadoop-2.5.1/etc/hadoop/scp /opt/modules/hadoop-2.5.1/etc/hadoop/yarn-site.xml root@node5:/opt/modules/hadoop-2.5.1/etc/hadoop/scp /opt/modules/hadoop-2.5.1/etc/hadoop/mapred-site.xml root@node5:/opt/modules/hadoop-2.5.1/etc/hadoop/

4、在node1主机上启动yarn

[root@node1 hadoop-2.5.1]# ./sbin/start-yarn.sh

[root@node1 hadoop-2.5.1]# jps

5、启动单节点ResourceManager

[root@node5 hadoop-2.5.1]# ./sbin/yarn-daemon.sh start resourcemanager

[root@node5 hadoop-2.5.1]# jps

6、在浏览器地址栏上访问

http://node1:8088/cluster/nodes

http://node5:8088/cluster/nodes，页面会直接跳转到node1的页面

6.1、杀死node1主机的resourcemanager进程，http://node1:8088/cluster访问不成功

[root@node1 hadoop-2.5.1]# kill -9 8145

6.2、查看http://node5:8088/cluster发现node5节点的ResourceManager成为Active

6.3、在node1主机重新单节点启动ResourceManager，发现node1的ResourceManager变成了Standby

[root@node1 hadoop-2.5.1]# ./sbin/yarn-daemon.sh start resourcemanager