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https://issues.apache.org/jira/browse/OAK-2619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14367363#comment-14367363
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Julian Sedding commented on OAK-2619:
-------------------------------------
Note: I'm currently working on refining this. I will provide a new patch within
a week.
> Support merging content during upgrade
> --------------------------------------
>
> Key: OAK-2619
> URL: https://issues.apache.org/jira/browse/OAK-2619
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: upgrade
> Affects Versions: 1.1.7
> Reporter: Julian Sedding
> Priority: Minor
> Attachments: OAK-2619-patch
>
>
> When upgrading from Jackrabbit 2 to Oak there are several scenarios that
> could benefit from the ability to merge content rather than overwrite it.
> Especially in combination with OAK-2586, i.e. support to include/exclude
> selected paths from the copy operation, merging can become very useful.
> # Start vanilla product with an empty repo that writes some initial content,
> then copy content from a Jackrabbit 2 repo into this instance
> # Unify content from several Jackrabbit 2 repositories into a single Oak repo
> # Copy all content 1 week before the actual migration, then merge in the diff
> on migration day
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