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https://issues.apache.org/jira/browse/OAK-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507482#comment-13507482
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Michael Dürig commented on OAK-464:
-----------------------------------
Here is a short summary of our options on this. TBD.
* Move the rebase operation down to the Microkernel
** Easy and efficient to implement since the Microkernel has full access to the
journal
** No additional roundtrips between Microkernel and oak-core
** We lose the conflict handling logic that we currently have in oak-core (i.e.
{{ConflictHandler}})
* Implement the rebase operation on top of the Microkernel (status quo)
** Easy to implement, needs diffing between the involved node states though.
** Additional roundtrips between Microkernel and oak-core due to the diffing in
oak-core
** Inefficient wrt. to moving large subtrees. These will degrade to a full deep
move (i.e. each moved node will be newly added)
* Drop the rebase operation completely
** Increased changes of conflicts on commit
** No facility for resolving conflicts on client side
> RootImpl.rebase() doesn't handle move operations correctly
> ----------------------------------------------------------
>
> Key: OAK-464
> URL: https://issues.apache.org/jira/browse/OAK-464
> Project: Jackrabbit Oak
> Issue Type: Bug
> Reporter: Michael Dürig
>
> Doing {{RootImpl.rebase()}} causes moves to be changed to remove followed by
> add. Which causes moves of large sub trees to become very expensive.
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