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java.lang.IllegalArgumentException: protocol = socket host = null
via Stack Overflow by Vivek Vinodh
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com.jcraft.jsch.JSchException: No route to host at com.jcraft.jsch.Util.createSocket( at com.jcraft.jsch.Session.connect( at org.apache.hadoop.ha.SshFenceByTcpPort.tryFence( at org.apache.hadoop.ha.NodeFencer.fence( at org.apache.hadoop.ha.ZKFailoverController.doFence( at org.apache.hadoop.ha.ZKFailoverController.fenceOldActive( at org.apache.hadoop.ha.ZKFailoverController.access$1100( at org.apache.hadoop.ha.ZKFailoverController$ElectorCallbacks.fenceOldActive( at org.apache.hadoop.ha.ActiveStandbyElector.fenceOldActive( at org.apache.hadoop.ha.ActiveStandbyElector.becomeActive( at org.apache.hadoop.ha.ActiveStandbyElector.processResult( at org.apache.zookeeper.ClientCnxn$EventThread.processEvent( at org.apache.zookeeper.ClientCnxn$