[infinispan-issues] [JBoss JIRA] (ISPN-3318) Migrate data from one cache store to another

[Galder Zamarreño (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789183#comment-12789183 ] 

Galder Zamarreño commented on ISPN-3318:
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Interesting idea from Randall:

{quote}Let's look at this from a user's perspective. Is it possible that the new file store **replaces** the old one, so that the user doesn't (really) need to know the difference? 

How similar are the configuration properties of each? Might it be possible to:
rename and deprecate the existing one (e.g., "org.infinispan.loaders.file.LegacyFileCacheStore"), changing it to 'package' or 'protected' (iff the new one is stable enough that the old one should definitely not be used anymore), 
rename the new one to "org.infinispan.loaders.file.FileCacheStore" (so that existing configurations work without change), 
have some code in the new one detect the old file structure and automatically run a migration to convert from the old file structure to the new format (and possibly move the old files into a subdirectory)

If this is possible, this is by far the best option for users since it provides a simple (perhaps even transparent) migration path with little if any changes required to configurations, but at the same time it allows the developers to get what they want: a new FCS that replaces the old one (which goes away).{quote}
                
> Migrate data from one cache store to another
> --------------------------------------------
>
>                 Key: ISPN-3318
>                 URL: https://issues.jboss.org/browse/ISPN-3318
>             Project: Infinispan
>          Issue Type: Task
>          Components: Loaders and Stores
>            Reporter: Galder Zamarreño
>            Assignee: Galder Zamarreño
>             Fix For: 6.0.0.Final
>
>
> Find a generic way to transfer data from one cache store to another, which could involve different Infinispan versions. This is handy to migrate file cache store based users to single file cache store (ISPN-2806).
> Ideally, this should be added as a recipe for rolling upgrades.

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