In a multi node ksafe Vertica cluster one of the nodes has crashed. The exception in the vertica.log shows ....
In order to force the recovery of the database on the problem node, run the following command as the database user (default: dradmin):
./adminTools -t restart_node -d <DATABASE_NAME> -p <PASSWORD> -F -s <IP_Address_of_Node>
Now, when you open adminTools and choose option #1 to "View Database Cluster State" the status should be "Recovering" This process may take a significant amount of time depending on the size of the database but once it is complete you will be able to successfully start the database on the node.
Note: you can run ./adminTools -h to get a full list of adminTools options.