Chiming in late on this one.
When it comes to cluster synchronization the jdbconfig module only solves
part of the problem, and the synchronization problem pops up elsewhere,
most notably in the ResourcePool. It is not a problem for adding new
configuration objects but is a problem for updating existing ones.
For instance consider changing the configuration of an existing data store.
Even though every node in the cluster will see the changed configuration
the next time they access that store they won't know it changed so won't
know to expire the cached resource for it.
The only way I have seen this effectively solved is with the addition of a
messaging/synchronization component that nodes in the cluster use to
broadcast change events to the rest of the cluster.
On Mon, Sep 30, 2013 at 2:12 AM, Paulius Litvinas <[email protected]>wrote:
> Ok. I got it. Thanks for the help****
>
> ** **
>
> *From:* [email protected] [mailto:[email protected]] *On Behalf
> Of *Andrea Aime
> *Sent:* Monday, September 30, 2013 11:10 AM
> *To:* Paulius Litvinas
> *Cc:* Alessio Fabiani; geoserver-users
>
> *Subject:* Re: [Geoserver-users] jdbcconfig module****
>
> ** **
>
> On Mon, Sep 30, 2013 at 10:01 AM, Paulius Litvinas <[email protected]>
> wrote:****
>
> Hi Alessio,****
>
> ****
>
> I have 3 GeoServer clustered instances with load balancing.****
>
> After I installed jdbcconfig module I added new layer on one GeoServer
> instance. I understand that with jdbcconfig module settings are stored on
> PostgreSQL and sinchronized between other instances (using same data dir).
> The same new layer appeared automaticaly on other GeoServer instances
> without restarting (reload config).****
>
> ****
>
> Also on one GeoServer instance I created tile cache for this layer, but
> unfortunately this tile cache did not appeared on other GeoServer
> instances. I had to reload config, so I gues settings for GeoWebCache is
> stored in files.****
>
> ****
>
> I expected that GeoWebCache settings also are stored in same database
> using jdbcconfig module and they will be sinchonized automaticaly on all
> GeoServer instances.****
>
> ** **
>
> Nope, you're right, GeoWebCache uses a separate set of xml files to store
> its configuration, which makes it****
>
> unreachable for the jdbcconfig module.****
>
> This is true for a number of other extensions and subsystem, there was a
> question about which config elements****
>
> are actually stored in the db, and which not, some time ago on this list,
> have a look in the archives, I've tried****
>
> to list things that cannot be stored in the dbms without also changing the
> way those GeoServer modules work****
>
> ** **
>
> Cheers****
>
> Andrea****
>
> ** **
>
> -- ****
>
> ==****
>
> Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
> information.****
>
> ==****
>
> ** **
>
> Ing. Andrea Aime ****
>
> @geowolf****
>
> Technical Lead****
>
> ** **
>
> GeoSolutions S.A.S.****
>
> Via Poggio alle Viti 1187****
>
> 55054 Massarosa (LU)****
>
> Italy****
>
> phone: +39 0584 962313****
>
> fax: +39 0584 1660272****
>
> mob: +39 339 8844549****
>
> ** **
>
> http://www.geo-solutions.it****
>
> http://twitter.com/geosolutions_it****
>
> ** **
>
> -------------------------------------------------------****
>
>
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--
*Justin Deoliveira*
Vice President, Engineering | Boundless
[email protected]
@j_deolive <https://twitter.com/j_deolive>
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