Created attachment 1326542 [details]
hawkular logs and configuration

Description of problem:
Hawkular is not becoming ready and after reading the logs (attached) I have spotted two errors:

* The first error seems to come after an alter table:

2017-09-13 11:46:29,930 INFO  [org.cassalog.core.CassalogImpl] (ServerService Thread Pool -- 71) Applying ChangeSet
-- version: 4.0
ALTER TABLE conditions ADD activeRules set<text>
--
2017-09-13 11:46:29,976 ERROR [org.jboss.as.ejb3.invocation] (ServerService Thread Pool -- 71) WFLYEJB0034: EJB Invocation failed on component CassCluster for method public com.datastax.driver.core.Session org.hawkular.alerts.engine.impl.CassCluster.getSession(): javax.ejb.EJBException: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:187)
...
Caused by: com.datastax.driver.core.exceptions.InvalidQueryException: Invalid column name activerules because it conflicts with an existing column
Version-Release number of selected component (if applicable):

 * The second one is about a missing class that should be included (confirmed myself) in the netty-all-4.0.35.Final-redhat-1.jar dependency

2017-09-13 11:47:00,496 WARN  [io.netty.channel.DefaultChannelPipeline] (cluster3-nio-worker-0) An exception was thrown by a user handler's exceptionCaught() method while handling the following exception:: java.lang.NoClassDefFoundError: Could not initialize class io.netty.handler.timeout.IdleStateEvent

How reproducible:
Only on customer environment

Additional info:
- nodetool shows all three nodes up/normal
- service-IP of hawkular-cassandra is resolved and requests seem to be forwarded: 
    > sh-4.2$ curl http://hawkular-cassandra:9042                                                                                                                                                                                                          
    > curl: (56) Recv failure: Connection reset by peer
    > sh-4.2$ curl http://hawkular-cassandra:7000                                                                                                                                                                                                     
    > curl: (7) Failed connect to hawkular-cassandra:7000; Connection refused
- cassandra cluster removed and recreated from scratch --> still same error in Hawkular

Hawkular
- scale down/scale up -> still same error
- deleted and new replica started by rc -> still same error