Question

我正在尝试构建一个3节点集群（2个Namenode（nn1，nn2）和1个datanode（dn1））。使用Namenode WEBUI，我能够查看nn1是否处于活动状态，而nn2是支持。但是，当我杀死活动的nn1时，备用nn2不会激活。请帮助我，我做错了什么或需要修改什么

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

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）

<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）停止nn1（活动节点） https://pastebin.com/bWvfnanQ

Answer 1

您在 core-site.xml 中为HA群集提及<IP>:<port> fs.defaultFS。因此，在关闭活动名称节点时，它不知道重定向的位置。

选择名称服务的逻辑名称，例如“mycluster”。

然后更改hdfs-site.xml，dfs.namenode.http-address.[nameservice ID].[name node ID] - 要监听的每个NameNode的完全限定HTTP地址

在您的情况下，您必须提供

芯-site.xml中

<property>
<name>fs.defaultFS</name>
<value>hdfs://myCluster</value>
</property>

HDFS-site.xml中

 <property>
 <name>dfs.namenode.rpc-address.myCluster.nn1</name>
 <value>192.168.10.153:9000</value>
 </property>

清楚阅读手册https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html

希望这会对你有所帮助。

Answer 2

您必须查看自动故障转移的防护

https://stackoverflow.com/a/27272565/3496666

https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html

自动故障转移无法在Hadoop中运行

2 个答案: