HAhadoop集群namenode无法自动切换成active

配了个haHadoo集群，手动kill -9了1号机的namenode，发现2号不能自动变为active，查看日志报错：

写道

2018-10-31 14:11:02,098 INFO org.apache.hadoop.ha.NodeFencer: ====== Beginning Service Fencing Process... ======
2018-10-31 14:11:02,098 INFO org.apache.hadoop.ha.NodeFencer: Trying method 1/1: org.apache.hadoop.ha.SshFenceByTcpPort(null)
2018-10-31 14:11:02,099 WARN org.apache.hadoop.ha.SshFenceByTcpPort: Unable to create SSH session
com.jcraft.jsch.JSchException: java.io.FileNotFoundException: /home/root/.ssh/id_rsa (No such file or directory)
at com.jcraft.jsch.KeyPair.load(KeyPair.java:543)
at com.jcraft.jsch.IdentityFile.newInstance(IdentityFile.java:40)
at com.jcraft.jsch.JSch.addIdentity(JSch.java:407)
at com.jcraft.jsch.JSch.addIdentity(JSch.java:367)
at org.apache.hadoop.ha.SshFenceByTcpPort.createSession(SshFenceByTcpPort.java:122)
at org.apache.hadoop.ha.SshFenceByTcpPort.tryFence(SshFenceByTcpPort.java:91)
at org.apache.hadoop.ha.NodeFencer.fence(NodeFencer.java:97)
at org.apache.hadoop.ha.ZKFailoverController.doFence(ZKFailoverController.java:532)
at org.apache.hadoop.ha.ZKFailoverController.fenceOldActive(ZKFailoverController.java:505)
at org.apache.hadoop.ha.ZKFailoverController.access$1100(ZKFailoverController.java:61)
at org.apache.hadoop.ha.ZKFailoverController$ElectorCallbacks.fenceOldActive(ZKFailoverController.java:892)
at org.apache.hadoop.ha.ActiveStandbyElector.fenceOldActive(ActiveStandbyElector.java:921)
at org.apache.hadoop.ha.ActiveStandbyElector.becomeActive(ActiveStandbyElector.java:820)
at org.apache.hadoop.ha.ActiveStandbyElector.processResult(ActiveStandbyElector.java:418)
at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:599)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
Caused by: java.io.FileNotFoundException: /home/root/.ssh/id_rsa (No such file or directory)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:195)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileInputStream.<init>(FileInputStream.java:93)
at com.jcraft.jsch.Util.fromFile(Util.java:508)
at com.jcraft.jsch.KeyPair.load(KeyPair.java:540)
... 15 more
2018-10-31 14:11:02,099 WARN org.apache.hadoop.ha.NodeFencer: Fencing method org.apache.hadoop.ha.SshFenceByTcpPort(null) was unsuccessful.
2018-10-31 14:11:02,099 ERROR org.apache.hadoop.ha.NodeFencer: Unable to fence service by any configured method.
2018-10-31 14:11:02,099 WARN org.apache.hadoop.ha.ActiveStandbyElector: Exception handling the winning of election
java.lang.RuntimeException: Unable to fence NameNode at hadoop1/192.168.150.151:9000
at org.apache.hadoop.ha.ZKFailoverController.doFence(ZKFailoverController.java:533)
at org.apache.hadoop.ha.ZKFailoverController.fenceOldActive(ZKFailoverController.java:505)
at org.apache.hadoop.ha.ZKFailoverController.access$1100(ZKFailoverController.java:61)
at org.apache.hadoop.ha.ZKFailoverController$ElectorCallbacks.fenceOldActive(ZKFailoverController.java:892)
at org.apache.hadoop.ha.ActiveStandbyElector.fenceOldActive(ActiveStandbyElector.java:921)
at org.apache.hadoop.ha.ActiveStandbyElector.becomeActive(ActiveStandbyElector.java:820)
at org.apache.hadoop.ha.ActiveStandbyElector.processResult(ActiveStandbyElector.java:418)
at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:599)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
2018-10-31 14:11:02,099 INFO org.apache.hadoop.ha.ActiveStandbyElector: Trying to re-establish ZK session
2018-10-31 14:11:02,102 INFO org.apache.zookeeper.ZooKeeper: Session: 0x166c8a424df00fb closed
2018-10-31 14:11:03,102 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=hadoop1:2181,hadoop2:2181,hadoop3:2181 sessionTimeout=5000 watcher=org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef@14671dfe
2018-10-31 14:11:03,103 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server hadoop2/192.168.150.152:2181. Will not attempt to authenticate using SASL (unknown error)
2018-10-31 14:11:03,104 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to hadoop2/192.168.150.152:2181, initiating session
2018-10-31 14:11:03,106 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete on server hadoop2/192.168.150.152:2181, sessionid = 0x266c8a421c9010f, negotiated timeout = 5000
2018-10-31 14:11:03,106 INFO org.apache.zookeeper.ClientCnxn: EventThread shut down
2018-10-31 14:11:03,107 INFO org.apache.hadoop.ha.ActiveStandbyElector: Session connected.
2018-10-31 14:11:03,107 INFO org.apache.hadoop.ha.ActiveStandbyElector: Checking for any old active which needs to be fenced...
2018-10-31 14:11:03,108 INFO org.apache.hadoop.ha.ActiveStandbyElector: Old node exists: 0a086d796861646f6f7012036e6e311a076861646f6f703120a84628d33e
2018-10-31 14:11:03,108 INFO org.apache.hadoop.ha.ZKFailoverController: Should fence: NameNode at hadoop1/192.168.150.151:9000

 主要是这个

写道

com.jcraft.jsch.JSchException: java.io.FileNotFoundException: /home/root/.ssh/id_rsa (No such file or directory)

 测试ssh几台机器都可以相互免密ssh登录，后来发现hdfs-site.xml 中的sshfence配置是用来通过 ssh 登录到前一个 active NameNode上将其补刀杀死用的，以便于确定只有一个 active NameNode，dfs.ha.fencing.ssh.private-key-files是配置本机私钥文件的存放地址，我的私钥地址配置错了，所以无法补刀，所以备用的namenode不能确定只有它活着，所以不敢转为active状态。

我的秘钥放在/root/.ssh/id_rsa，而之前配置成了 /home/root/.ssh/id_rsa