We did an upgrade of our Ambari installation from version 1.2.0 to 126.96.36.199. For the upgrade we follwed the instructions according to the manual http://incubator.apache.org/ambari/1.2.3/installing-hadoop-using-ambari/content/ambari-chap7.html
The upgrade went fine and also the agent upgrade didn’t give any errors. When we log in into the console we see that all the services are up and running. The only thing we don’t see is hostnames. In the host section no hosts are listed. And also in the services section no hostnames are listed (NameNode, JobTracker, Hbase Master) everything is empty. When I click the link to go the namenode UI I get redirected to http://null:50070
We checked the server logs and we do find some messages:
09:49:22,033 WARN ServletHandler:514 – /api/v1/clusters/poc_adm/hosts/null/host_components/NAMENODE
09:50:22,111 ERROR ReadHandler:82 – Caught a runtime exception executing a query
We do see heartbeats from the datanodes coming into the log.