I have the same problem and this is what I see in that file
[EL Warning]: metadata: 2015-01-30 12:04:56.246--ServerSession(884120422)--The reference column name [resource_type_id] mapped on the element [field permissions] does not correspond to a valid id or basic field/column on the mapping reference. Will use referenced column name as provided. /var/log/ambari-server/ambari-server.out