[jboss-jira] [JBoss JIRA] Commented: (JBCACHE-964) Create Transforming CacheLoaders that transform 1.x formatted data into 2.x format

Create Transforming CacheLoaders that transform 1.x formatted data into 2.x format ---------------------------------------------------------------------------------- Key: JBCACHE-964 URL: http://jira.jboss.com/jira/browse/JBCACHE-964 Project: JBoss Cache Issue Type: Task Security Level: Public(Everyone can see) Components: Cache loaders Reporter: Galder Zamarreno Assigned To: Galder Zamarreno Priority: Minor Fix For: 2.0.0.GA, 2.0.0.CR1 Time Spent: 3 days, 4 hours Remaining Estimate: 0 minutes 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. The default in 2.x should be to use VAM and only people who are resilient to change their existing stores to VAM should use the 1.x option, which would need explicitly definition. This option also makes it easier for migration purpouses as customers should be able to start two cache instances with different cache loader marshalling method set. They could then loop through the first one using get operations and call put in the second instance. Just note that this does not apply to the marshalling done at replication level as there's no hard data that needs migrating.