Hi Hervé,
Ah ok for Fuse ESB, I was thinking you talked about ServiceMix 4.3 ;)
For the Hazelcast queues, yes, it's an alternative to JMS. You have
quite the same functionalities but without all the configuration of the
JMS brokers/networkConnectors, etc.
Regards
JB
On 02/21/2012 07:25 PM, Hervé BARRAULT wrote:
Hi, thanks for the answer.
The version used is a fuse ESB 4.3.0 (karaf 2.0.0) which is an earlier
version (some difficulties to understand the way they name their releases),
so i should upgrade.
By reading your article, i will also check the functionalities offered by
the Hazelcast queues (for JMS replacement ?).
Regards
Hervé
On Tue, Feb 21, 2012 at 7:04 PM, Jean-Baptiste Onofré<[email protected]>wrote:
Hi Hervé,
With DOSGi, a service is registered in the OSGi framework with a "cluster
aware" flag.
When you bind a reference to this service, first, the "DOSGi engine" looks
for a service in the local OSGi service registry.
In the local registry, the service could be local or a kind of "proxy" to
another a service on another node (in Cellar, it uses a distributed
Hazelcast map for that).
DOSGi is not designed for failover, but for distribution.
However, DOSGi/Cellar could be used in a kind of LB/HA/FailOver way by
adding some layer on top of that. For instance, I blogged about how to use
Cellar Hazelcast instance to communicate between two Camel routes:
http://blog.nanthrax.net/2012/**02/communication-between-two-**
remote-camel-routes-using-**karaf-cellar/<http://blog.nanthrax.net/2012/02/communication-between-two-remote-camel-routes-using-karaf-cellar/>
You can use Cellar 2.2.x with ServiceMix 4.3 as it runs on Karaf 2.2.x.
Regards
JB
On 02/21/2012 06:34 PM, Hervé BARRAULT wrote:
Hi,
I would use multiple servicemix instance to do the same job.
If an instance is overloaded, I would be able to call another instance to
continue the processing.
I thought exposing a remote OSGI service in the cluster (one by instance).
When one instance receive a message, it should call a local service.
If it is overloaded or other reason (i have my own rule to determine it),
it would call another instance to process it.
I have seen this document
http://blog.nanthrax.net/2011/**11/apache-karaf-cellar-and-**dosgi/<http://blog.nanthrax.net/2011/11/apache-karaf-cellar-and-dosgi/>
.
Which are compulsory libraries for doing this mechanism (Cellar, a DOSGI
implementation (in CXF for example), ...) ?
If a “local” echoService exists, the OSGi framework will bind the
reference to this service, else Cellar will look for a distributed
service
(on all node) exporting the EchoService>>interface and bind a proxy to the
distributed service.
Is this determination static or dynamic ? Is another instance called if a
communication error happen ?
For Information, I am currently using a 4.3 servicemix version (so i
assume
that i should upgrade it).
Thanks for answers
Regards
Hervé
--
Jean-Baptiste Onofré
[email protected]
http://blog.nanthrax.net
Talend - http://www.talend.com
--
Jean-Baptiste Onofré
[email protected]
http://blog.nanthrax.net
Talend - http://www.talend.com
