Adrian Brock wrote:
On Wed, 2003-12-10 at 15:14, Sebastian Hauer wrote:reference to the terms of executed transactions should be treated as preliminary only and subject to our formal written confirmation.
Hi Ivelin,
I think its great that JBoss offers now some kind of JMS clustering. In
my opinion this was a long missing feature.
I think I understand most of the drawbacks of the singleton MBean based
failover, yet there is something in regards to JMS I am not sure about.
What if the cluster partition splits (e.g. networking problem) and we
end up with 2 autonomous partitions temporarily. Then the singleton
MBean in both partitions would elect a new master node, so each
partition would have its own master. In case of JMS we would end up
with 2 JMS servers. As soon as the networking issue is resolved the 2
partitions would merge and again the singleton MBeans would elect a new
master so that the merged cluster ends up with only one JMS server. So my question is, is there any harm or reliability issue for JMS during
the time when 2 JMS nodes are up at the same time?
This would not work, you would end up with two servers modifying the
same persistent store each with different ideas about what is the next
message id and transaction id. Most likely this would fail with some primary key constraint violation
or data not found.
The only way to make this work would be to have cluster safe unique
keys (such as a GUID) and force jms to restart on any newly elected
master (even if it was previously a master) to "merge" the db changes as the cluster partitions are merged.
Regards, Adrian
Regards, Sebastian
-----Original Message-----
From: Ivelin Ivanov [mailto:[EMAIL PROTECTED] Sent: Saturday, December 06, 2003 12:12 PM
To: Sacha Labourey; [EMAIL PROTECTED]; '[EMAIL PROTECTED]'
Subject: RE: [JBoss-user] JMS Clustering
See this document for a detailed description: http://www.cocoonhive.org/articles/jboss/20031125/JBoss32-hajms.html
The code is simple and solid. If you describe your use case I may be able to advise
whether it will work for you.
Regards,
Ivelin
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