2018-06-15 11:37:08,435 INFO SshFenceByTcpPort.jsch (SshFenceByTcpPort.java:log(302)) - Disconnecting from yjd-nn-48-66.meizu.mz port 16120

2018-06-15 11:37:08,438 WARN ha.NodeFencer (NodeFencer.java:fence(108)) - Fencing method org.apache.hadoop.ha.SshFenceByTcpPort(hdfs:16120) was unsuccessful.

2018-06-15 11:37:08,438 ERROR ha.NodeFencer (NodeFencer.java:fence(111)) - Unable to fence service by any configured method.

2018-06-15 11:37:08,438 INFO SshFenceByTcpPort.jsch (SshFenceByTcpPort.java:log(302)) - Caught an exception, leaving main loop due to Socket closed

2018-06-15 11:37:08,445 WARN ha.ActiveStandbyElector (ActiveStandbyElector.java:becomeActive(828)) - Exception handling the winning of election

java.lang.RuntimeException: Unable to fence NameNode at yjd-nn-48-66.meizu.mz/10.129.48.66:8021

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)

问题描述：

hadoop HA sshfen切换隔离时无法跳转ssh: bash: fuser: 未找到命令

在zkfc的日志里面，有一个warn：PATH=$PATH:/sbin:/usr/sbin fuser -v -k -n tcp 8090 via ssh: bash: fuser: 未找到命令

解决方案：

原因是最小化安装centos的时候，没有fuser这个命令，导致无法fence

yum install psmisc就行了

/opt/hadoop/bin/hdfs haadmin -transitionToStandby nn1 --forcemanual