Bug 1016670

Summary:	Failback unbounds destinations from JNDI in collocated HA topology
Product:	[JBoss] JBoss Enterprise Application Platform 6	Reporter:	Miroslav Novak <mnovak>
Component:	HornetQ	Assignee:	Clebert Suconic <csuconic>
Status:	CLOSED EOL	QA Contact:	Miroslav Novak <mnovak>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	6.2.0	CC:	ataylor, csuconic, jbertram, jmesnil, msvehla, myarboro
Target Milestone:	---
Target Release:	EAP 6.4.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-08-19 12:43:54 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1078702
Bug Blocks:

Description Miroslav Novak 2013-10-08 13:48:03 UTC

Description of problem:
Test scenario:
1. Start 2 EAP 6.x servers in collocated HA topology with shared journal
2. Kill 2nd server -> failover occurs
3. Start 2nd server -> failback occurs

Result:
Queues/Topics are unbound from JNDI on 1st server.

During Failback the HQ backup on 1st server is shutdowned and this unbounds destinations from JNDI. Problem is that there is still HQ live running which do not have queues/topics in JNDI on 1st server. Same queues/topics were defined in configuration for live and also for backup (on 1st server). 

If queues/topics are removed from configuration of HQ backup then after failback are all queues/topics still in JNDI.

Expected results:
We can discuss what we can do in this case. My suggestions are:
1. option:
Document this behavior - "Do not configure destinations in collocated backup..."
2. Improve integration for collocated backup. It'd detect live server and does not undeploy destinations "shared" destination. Or print warning during start of the server. I'm not sure if it's possible. 

I guess the same behavior is for deployed connection factories but I did not try it.

Comment 1 Miroslav Novak 2014-03-19 10:58:33 UTC

There is still the same problem in EAP 6.3.0.DR4. (HQ 2.3.18.Final).

Comment 2 Justin Bertram 2014-03-19 18:27:56 UTC

Your first comment states, "Same queues/topics were defined in configuration for live and also for backup (on 1st server)."

As far as I can tell, this is a simple misconfiguration.  You should not, in fact, configure any JNDI resources on the colocated backup.  It should only have the very basic configuration elements it needs to start as exemplified by the <JBOSS_HOME>/docs/examples/configs/standalone-hornetq-colocated.xml shipped with JBoss EAP.

As you suggest, the JBoss EAP documentation should be adjusted to reflect this.

In the future we are doing to simplify the declaration of a backup server so this whole configuration process is simpler.

Comment 3 Miroslav Novak 2014-03-20 08:23:49 UTC

Hi Justin,

thanks for feedback. I just don't want to loose focus from this bz as it appears to be not intuitive. For dedicated backup we have to specify destinations in its configuration but for colocated backup we cannot.

Doc will be fine, improvement great. I'll create new bz to document this and keep this open for tracking progress.

Thanks,
Mirek