[jbosscache-dev] migrating data stored in 1.x format to VAM format

[Manik Surtani]

I see what you mean, although I would like the default to be to use  
the VAM.

--
Manik Surtani

Lead, JBoss Cache
JBoss, a division of Red Hat

Email: manik at jboss.org
Telephone: +44 7786 702 706
MSN: manik at surtani.org
Yahoo/AIM/Skype: maniksurtani



On 30 Jan 2007, at 20:45, Galder Zamarreno wrote:

> Actually, the more I think about this, the less I like the idea of  
> switching the marshalling from 1.x to 2.x at the CacheLoaders  
> level, or at least forcing them to do so.
>
> Customers that want to use JBossCache 2.x might be reluctant to  
> migrate their data from one format to the other. I can see how an  
> existing customer might think this is a proper pain in the ass,  
> independent of the benefits, and might reduce adoption among them.
>
> We want to remove barriers upgrading, but at the same time, we want  
> new customer to use new marshalling, so I'd actually implement the  
> possibility to use 1.x marshalling which is plan java serialization  
> at the CacheLoader level. This could easily achieved adding a  
> property to the <properties> section.
>
> Just note that this does not apply to the marshalling done at  
> replication level as there's no hard data that needs migrating.
>
> Galder Zamarreño
> Sr. Software Maintenance Engineer
> JBoss, a division of Red Hat
>
> -----Original Message-----
> From: jbosscache-dev-bounces at lists.jboss.org [mailto:jbosscache-dev- 
> bounces at lists.jboss.org] On Behalf Of Galder Zamarreno
> Sent: 25 January 2007 13:07
> To: jbosscache-dev at lists.jboss.org
> Subject: [jbosscache-dev] migrating data stored in 1.x format to  
> VAM format
>
> Hi all,
>
> I'm deferring http://jira.jboss.com/jira/browse/JBCACHE-879 to  
> BETA2 because I still need to write this: http://jira.jboss.com/ 
> jira/browse/JBCACHE-882
>
> The reason I'm deferring it is because I can't see a  
> straightforward way of doing such thing right now. Ideally, you  
> should be able run a 1.x version (cache1) and a 2.x version  
> (cache2) of JBC in the same VM so that you can do a loop of  
> cache1.get() and call cache2.put(). However, I have doubts that  
> that this approach will be free of class loading issues. What do  
> you think?
>
> I was wondering whether Region based could help here, but I can't  
> see right now how this could be done.
>
> Something I had in mind is having the capability of to start a  
> cache with either 1.x marshalling or VAM marshalling, but oriented  
> at being used only at the cache loader level. It wouldn't make much  
> sense for replication because there's no hard data there.
>
>
> I thought that you could start two instances of cache 2.x, first  
> with 1.x. marshalling and the other one with VAM both pointing to  
> different JDBCCacheLoader stores. You could then get from the first  
> using normal mmarshalling and put in the second one which has VAM  
> marshalling active, what do you think?
>
> If you like the approach, I should be have it ready by BETA2.
>
> This last approach looks simpler to me, what do you think?
>
> Galder Zamarreño
> Sr. Software Maintenance Engineer
> JBoss, a division of Red Hat
>
>
>
> _______________________________________________
> jbosscache-dev mailing list
> jbosscache-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/jbosscache-dev
>
> _______________________________________________
> jbosscache-dev mailing list
> jbosscache-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/jbosscache-dev