[英]Automatic Failover not working in Hadoop
I'm trying to build a 3 node cluster (2 Namenode(nn1,nn2) and 1 datanode(dn1)) .Using Namenode WEBUI, I'm able to view that nn1 is active and nn2 is standby. 我正在尝试构建3个节点的群集(2个Namenode(nn1,nn2)和1个datanode(dn1))。使用Namenode WEBUI,我可以看到nn1是活动的,而nn2是备用的。 however, when I kill the active nn1, standby nn2 is not going active.
但是,当我杀死活动nn1时,备用nn2不会活动。 Please help me what am I doing wrong or what needs to be modified
请帮助我我做错了什么或需要修改什么
nn1 /etc/hosts nn1 / etc / hosts
127.0.0.1 localhost
192.168.10.153 nn1
192.168.10.154 dn1
192.168.10.155 nn2
nn2 /etc/hosts nn2 / etc / hosts
127.0.0.1 localhost nn2
127.0.1.1 ubuntu
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
core-site.xml (nn1,nn2) core-site.xml(nn1,nn2)
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://192.168.10.153:8020</value>
</property>
<property>
<name>dfs.journalnode.edits.dir</name>
<value>/usr/local/hadoop/hdfs/data/jn</value>
</property>
<property>
<name>ha.zookeeper.quorum</name>
<value>192.168.10.153:2181,192.168.10.155:2181,192.168.10.154:2181</value>
</property>
</configuration>
hdfs-site.xml(nn1,nn2,dn1) HDFS-site.xml中(NN1,NN2,DN1)
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
<property>
<name>dfs.nameservices</name>
<value>ha-cluster</value>
</property>
<property>
<name>dfs.ha.namenodes.ha-cluster</name>
<value>nn1,nn2</value>
</property>
<property>
<name>dfs.namenode.rpc-address.ha-cluster.nn1</name>
<value>192.168.10.153:9000</value>
</property>
<property>
<name>dfs.namenode.rpc-address.ha-cluster.nn2</name>
<value>192.168.10.155:9000</value>
</property>
<property>/usr/local/hadoop/hdfs/datanode</value>
<name>dfs.namenode.http-address.ha-cluster.nn1</name>
<value>192.168.10.153:50070</value>
</property>
<property>
<name>dfs.namenode.http-address.ha-cluster.nn2</name>
<value>192.168.10.155:50070</value>
</property>
<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>qjournal://192.168.10.153:8485;192.168.10.155:8485;192.168.10.154:8485/ha-cluster</value>
</property>
<property>
<name>dfs.client.failover.proxy.provider.ha-cluster</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>
<property>
<name>dfs.ha.automatic-failover.enabled</name>
<value>true</value>
</property>
<property>
<name>ha.zookeeper.quorum</name>
<value>192.168.10.153:2181,192.168.10.155:2181,192.168.10.154:2181</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/ci/.ssh/id_rsa</value></property></configuration>
LOGS :(zkfc nn1,nn2)(namenode nn1,nn2) on stopping nn1(active node) https://pastebin.com/bWvfnanQ 日志:(zkfc nn1,nn2)(namenode nn1,nn2)在停止nn1(活动节点)时https://pastebin.com/bWvfnanQ
Your mentioning <IP>:<port>
for fs.defaultFS
in core-site.xml for a HA cluster. 您在HA群集的core-site.xml中
fs.defaultFS
<IP>:<port>
。 So when shutting down your active namenode, it doesn't know where to redirect. 因此,当关闭活动的名称节点时,它不知道重定向到哪里。
Choose logical name for a nameservice, for example “mycluster”. 选择名称服务的逻辑名称,例如“ mycluster”。
Then change in hdfs-site.xml as well, dfs.namenode.http-address.[nameservice ID].[name node ID]
- the fully-qualified HTTP address for each NameNode to listen on 然后也更改hdfs-site.xml,即
dfs.namenode.http-address.[nameservice ID].[name node ID]
-每个NameNode监听的标准HTTP地址
In your case, you have to give 就您而言,您必须付出
core-site.xml 核心的site.xml
<property>
<name>fs.defaultFS</name>
<value>hdfs://myCluster</value>
</property>
hdfs-site.xml HDFS-site.xml中
<property>
<name>dfs.namenode.rpc-address.myCluster.nn1</name>
<value>192.168.10.153:9000</value>
</property>
Read the manual clearly https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html 清楚阅读手册https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html
Hope this will help you. 希望这会帮助你。
You have to look fencing for automatic failover 您必须寻找防护以进行自动故障转移
https://stackoverflow.com/a/27272565/3496666 https://stackoverflow.com/a/27272565/3496666
https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html
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